OT: Haunted PC

So my desktop windows machine started turning itself on, with no
intervention.

WOL off, wake on USB off, wake on mouse off, wake on keyboard off, wake
on power on off.

Wake on *anything* off.

Came up completely randomly. Got to the point where I turned it off at
the power supply. Which was fine until the next morning. Turned the
switch back on but the damned thing would not start up.

Until I left the room.......

Whereupon it booted itself.

So I just left it running until today and started serious
troubleshooting. USB was suspicious as the hub and card reader were not
functioning. All cables secure, fans OK.

No better.

Swapped the PSU and it's suddenly all fine.

SO how does a dodgy power supply boot the PC, then?
--
Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf
Triumph Sprint ST 1050: It's blue, see.
www.cuore-sportivo.co.uk

On Fri, 03 Aug 2007 20:50:03 GMT, Catman
<catman@rustcuore-sportivo.co.uk> wrote:

>So my desktop windows machine started turning itself on, with no
>intervention.
>
>WOL off, wake on USB off, wake on mouse off, wake on keyboard off, wake
>on power on off.
>
>Wake on *anything* off.
>
>Came up completely randomly. Got to the point where I turned it off at
>the power supply. Which was fine until the next morning. Turned the
>switch back on but the damned thing would not start up.
>
>Until I left the room.......
>
>Whereupon it booted itself.
>
>So I just left it running until today and started serious
>troubleshooting. USB was suspicious as the hub and card reader were not
>functioning. All cables secure, fans OK.
>
>No better.
>
>Swapped the PSU and it's suddenly all fine.
>
>SO how does a dodgy power supply boot the PC, then?

On an ATX PSU its just a short between two pins on the power connector
which turns the power on to the Mobo. Could be a duff capacitor or
diode leaking.
--
Drew.H, MIB#15

In the garage: MZ ETZ125, GS550MZ x 2
Departures: GSX1100FJ
Arrivals: CBR1100XXX

Catman wrote:

> Swapped the PSU and it's suddenly all fine.
>
> SO how does a dodgy power supply boot the PC, then?

Dentrite growth.

--
Cab :^) - I'm dyslex-spic apparently
GSX 1400 - Speedy Zimmerframe.
UKRMMA#10 (KOTL), IbW#015, BoB#4, POTM#3, SKA#1
email addy : ukrm_dot_cab_at_rosbif_dot_org
UKRM Firefox Extension: http://www.rosbif.org/ukrm/ukrm.xpi
The gingeometer: http://www.rosbif.org/ukrm/gingeometer/

In article <%xMsi.248067$LL7.140059@fe08.news.easynews.com> , Catman
wrote:
> SO how does a dodgy power supply boot the PC, then?

Dunno, but Ross had a job for a while at a firm which took on Packard
Bell PC warranty returns - they were supposed to identify the problem
components, replace, certify OK and they were sold on much cheapness[1]

He reports that quite frequently a particularly awkward machine would
be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics,
HDD & re-install, PSU, even case, resulting in a completely new
machine, which would *still* not work - at which point the techie[2]
would slap a sticker on it saying, simply, "ghost", and pass it on to
the next shift as SEP.

[1] not really
[2] not really

--
Rob_P
UKRM(at)indqualtec.co.uk
uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl)
FJ1200, (in bits) CCM130 (need sharpening)
Atonal apples and amplified heat available now!

On Aug 3, 6:06 pm, Rope <s...@ukrm.net> wrote:
> In article <%xMsi.248067$LL7.140...@fe08.news.easynews.com> , Catman
> wrote:
>
> > SO how does a dodgy power supply boot the PC, then?
>
> Dunno, but Ross had a job for a while at a firm which took on Packard
> Bell PC warranty returns - they were supposed to identify the problem
> components, replace, certify OK and they were sold on much cheapness[1]
>
> He reports that quite frequently a particularly awkward machine would
> be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics,
> HDD & re-install, PSU, even case, resulting in a completely new
> machine, which would *still* not work - at which point the techie[2]
> would slap a sticker on it saying, simply, "ghost", and pass it on to
> the next shift as SEP.

If there's a broken bit (e.g. PSU) in the first machine that then
fries the CPU, you could end up creating new problems with each
component swap.

Using the patented Mavis Beacon "Hunt&Peck" Technique, Christofire
<chris@ukrm.org> typed
>On Aug 3, 6:06 pm, Rope <s...@ukrm.net> wrote:
>> In article <%xMsi.248067$LL7.140...@fe08.news.easynews.com> , Catman
>> wrote:
>>
>> > SO how does a dodgy power supply boot the PC, then?
>>
>> Dunno, but Ross had a job for a while at a firm which took on Packard
>> Bell PC warranty returns - they were supposed to identify the problem
>> components, replace, certify OK and they were sold on much cheapness[1]
>>
>> He reports that quite frequently a particularly awkward machine would
>> be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics,
>> HDD & re-install, PSU, even case, resulting in a completely new
>> machine, which would *still* not work - at which point the techie[2]
>> would slap a sticker on it saying, simply, "ghost", and pass it on to
>> the next shift as SEP.
>
>If there's a broken bit (e.g. PSU) in the first machine that then
>fries the CPU, you could end up creating new problems with each
>component swap.

Quite. That's the problem when you decide that an "expensive" technician
can be replaced be a nice "cheap" board-swapper.

--
Wicked Uncle Nigel - "He's hopeless, but he's honest"

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 OMF#6 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (Fallen apart) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Honda ST1100 wiv trailer Norton 850 Commando
Kawasaki GTR1400

In article <$52Q91w5C7sGJAfv@rcav8r.demon.co.uk>, Wicked Uncle Nigel
says...
> Using the patented Mavis Beacon "Hunt&Peck" Technique, Christofire
> <chris@ukrm.org> typed
> >On Aug 3, 6:06 pm, Rope <s...@ukrm.net> wrote:
> >> In article <%xMsi.248067$LL7.140...@fe08.news.easynews.com> , Catman
> >> wrote:
> >>
> >> > SO how does a dodgy power supply boot the PC, then?
> >>
> >> Dunno, but Ross had a job for a while at a firm which took on Packard
> >> Bell PC warranty returns - they were supposed to identify the problem
> >> components, replace, certify OK and they were sold on much cheapness[1]
> >>
> >> He reports that quite frequently a particularly awkward machine would
> >> be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics,
> >> HDD & re-install, PSU, even case, resulting in a completely new
> >> machine, which would *still* not work - at which point the techie[2]
> >> would slap a sticker on it saying, simply, "ghost", and pass it on to
> >> the next shift as SEP.
> >
> >If there's a broken bit (e.g. PSU) in the first machine that then
> >fries the CPU, you could end up creating new problems with each
> >component swap.
>
> Quite. That's the problem when you decide that an "expensive" technician
> can be replaced be a nice "cheap" board-swapper.

Blessed are the 2nd generation self employed computer consultants.
--
Bear

Bear wrote:
> Blessed are the 2nd generation self employed computer consultants.

From someone who works with NHS IT?

--
Rob_P
UKRM(at)indqualtec.co.uk
uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl)
FJ1200, (in bits) CCM130 (need sharpening)
Atonal apples and amplified heat available now!

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Rope <spam@ukrm.net> saying
something like:

>In article <%xMsi.248067$LL7.140059@fe08.news.easynews.com> , Catman
>wrote:
>> SO how does a dodgy power supply boot the PC, then?
>
>Dunno, but Ross had a job for a while at a firm which took on Packard
>Bell PC warranty returns - they were supposed to identify the problem
>components, replace, certify OK and they were sold on much cheapness[1]
>
>He reports that quite frequently a particularly awkward machine would
>be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics,
>HDD & re-install, PSU, even case, resulting in a completely new
>machine, which would *still* not work - at which point the techie[2]
>would slap a sticker on it saying, simply, "ghost", and pass it on to
>the next shift as SEP.

PB have always been rubbish though. It surprises me not that cheap POS
like them give bother.
--
Dave
GS850x2 XS650 SE6a

Teach a man to fish and he and his pikey mates will have the
river cleaned out in a day.

Rope wrote:
> In article <%xMsi.248067$LL7.140059@fe08.news.easynews.com> , Catman
> wrote:
>> SO how does a dodgy power supply boot the PC, then?
>
> Dunno, but Ross had a job for a while at a firm which took on Packard
> Bell PC warranty returns - they were supposed to identify the problem
> components, replace, certify OK and they were sold on much cheapness[1]
>
> He reports that quite frequently a particularly awkward machine would
> be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics,
> HDD & re-install, PSU, even case, resulting in a completely new
> machine, which would *still* not work - at which point the techie[2]
> would slap a sticker on it saying, simply, "ghost", and pass it on to
> the next shift as SEP.

Why does this not surprise me. Been using PCs too long I spose

--
Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf
Triumph Sprint ST 1050: It's blue, see.
www.cuore-sportivo.co.uk

Cab wrote:
> Catman wrote:
>
>
>> Swapped the PSU and it's suddenly all fine.
>>
>> SO how does a dodgy power supply boot the PC, then?
>
> Dentrite growth.
>

Do you think I stopped it in time, or do I have Skynet in my office?

--
Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf
Triumph Sprint ST 1050: It's blue, see.
www.cuore-sportivo.co.uk

Catman wrote:
> So my desktop windows machine started turning itself on, with no
> intervention.
>
> WOL off, wake on USB off, wake on mouse off, wake on keyboard off,
> wake on power on off.
>
> Wake on *anything* off.
>
> Came up completely randomly. Got to the point where I turned it off
> at the power supply. Which was fine until the next morning. Turned
> the switch back on but the damned thing would not start up.
>
> Until I left the room.......
>
> Whereupon it booted itself.
>
> So I just left it running until today and started serious
> troubleshooting. USB was suspicious as the hub and card reader were
> not functioning. All cables secure, fans OK.
>
> No better.
>
> Swapped the PSU and it's suddenly all fine.
>
> SO how does a dodgy power supply boot the PC, then?

Something amiss in the PS_ON circuit. Loose component / dry joint / damaged
supply wire.

Page 26 - http://www.formfactors.org/developer...DG_rev_1_1.pdf

--
Cheerz - Brownz
http://www.brownz.org/

On Aug 3, 4:50 pm, Catman <cat...@rustcuore-sportivo.co.uk> wrote:
> Swapped the PSU and it's suddenly all fine.
>
> SO how does a dodgypower supplyboot the PC, then?

Long list of reasons. First, did you know a power supply is only one
component of a power supply system? If not, then a computer tech
would never understand this problem.

Second, power supply must provide power constantly to the power
supply controller. Not just power, but power within certain numbers.
Too much ripple voltage may trigger the power supply controller which
in term powers on supply. Just one example. Leakage on power
switch. Threshold for the Power On circuit too low. Or pullup
resistor defective or too undersized for the power supply.

Unfortunately, too many techs no longer know how to follow the
evidence. Instead they just swap parts until something works. Even
that does not prove the problem is solved. Just another reason why
some systems appear haunted.

Demonstrates are many who really do not know how a computer works
but somehow know how to fix it. For example, a power supply must not
damage anything in a computer - a standard from even 30+ years ago. A
CPU is even harder to harm. Still someone posted a dodgy power supply
frying a CPU? Nonsense traceable to a shortage of technical
knowledge. A+ Certified computer techs need not even know how
electricity works to become a certified 'computer expert'. That human
problem is more often the reason for a 'haunted' computer.

It would be an electrical problem. How many techs even know how to
use an oscilloscope or know what each wire between motherboard and
power supply does. Most all do not know any of that and will be angry
that they should know such simple concepts.

On Fri, 03 Aug 2007 20:50:03 GMT, Catman
<catman@rustcuore-sportivo.co.uk> dropped the following oil-slick:

>So my desktop windows machine started turning itself on, with no
>intervention.
>
:

>Came up completely randomly. Got to the point where I turned it off at
>the power supply.

I am surprised that people do not do this anyway. Unless you want the
computer on as a server or doing unattended work of course.
--
gomez
Honda TransAlp,KTM 640LC Enduro (For Sale)
(not is not to reply)
"The best tool for the job is the hammer thats nearest to hand"

gomez wrote:
> On Fri, 03 Aug 2007 20:50:03 GMT, Catman
> <catman@rustcuore-sportivo.co.uk> dropped the following oil-slick:
>
>> So my desktop windows machine started turning itself on, with no
>> intervention.
>>
> :
>
>> Came up completely randomly. Got to the point where I turned it off at
>> the power supply.
>
> I am surprised that people do not do this anyway. Unless you want the
> computer on as a server or doing unattended work of course.

I sometimes need to WOL it

--
Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf 156
V6 2.5 S2
Triumph Sprint ST 1050: It's blue, see.
www.cuore-sportivo.co.uk

	#1
Catman	OT: Haunted PC So my desktop windows machine started turning itself on, with no intervention. WOL off, wake on USB off, wake on mouse off, wake on keyboard off, wake on power on off. Wake on anything off. Came up completely randomly. Got to the point where I turned it off at the power supply. Which was fine until the next morning. Turned the switch back on but the damned thing would not start up. Until I left the room....... Whereupon it booted itself. So I just left it running until today and started serious troubleshooting. USB was suspicious as the hub and card reader were not functioning. All cables secure, fans OK. No better. Swapped the PSU and it's suddenly all fine. SO how does a dodgy power supply boot the PC, then? -- Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk

	#2
Drew.H	Re: OT: Haunted PC On Fri, 03 Aug 2007 20:50:03 GMT, Catman <catman@rustcuore-sportivo.co.uk> wrote: >So my desktop windows machine started turning itself on, with no >intervention. > >WOL off, wake on USB off, wake on mouse off, wake on keyboard off, wake >on power on off. > >Wake on anything off. > >Came up completely randomly. Got to the point where I turned it off at >the power supply. Which was fine until the next morning. Turned the >switch back on but the damned thing would not start up. > >Until I left the room....... > >Whereupon it booted itself. > >So I just left it running until today and started serious >troubleshooting. USB was suspicious as the hub and card reader were not >functioning. All cables secure, fans OK. > >No better. > >Swapped the PSU and it's suddenly all fine. > >SO how does a dodgy power supply boot the PC, then? On an ATX PSU its just a short between two pins on the power connector which turns the power on to the Mobo. Could be a duff capacitor or diode leaking. -- Drew.H, MIB#15 In the garage: MZ ETZ125, GS550MZ x 2 Departures: GSX1100FJ Arrivals: CBR1100XXX

	#3
Cab	Re: OT: Haunted PC Catman wrote: > Swapped the PSU and it's suddenly all fine. > > SO how does a dodgy power supply boot the PC, then? Dentrite growth. -- Cab :^) - I'm dyslex-spic apparently GSX 1400 - Speedy Zimmerframe. UKRMMA#10 (KOTL), IbW#015, BoB#4, POTM#3, SKA#1 email addy : ukrm_dot_cab_at_rosbif_dot_org UKRM Firefox Extension: http://www.rosbif.org/ukrm/ukrm.xpi The gingeometer: http://www.rosbif.org/ukrm/gingeometer/

	#4
Rope	Re: OT: Haunted PC In article <%xMsi.248067$LL7.140059@fe08.news.easynews.com> , Catman wrote: > SO how does a dodgy power supply boot the PC, then? Dunno, but Ross had a job for a while at a firm which took on Packard Bell PC warranty returns - they were supposed to identify the problem components, replace, certify OK and they were sold on much cheapness[1] He reports that quite frequently a particularly awkward machine would be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics, HDD & re-install, PSU, even case, resulting in a completely new machine, which would still not work - at which point the techie[2] would slap a sticker on it saying, simply, "ghost", and pass it on to the next shift as SEP. [1] not really [2] not really -- Rob_P UKRM(at)indqualtec.co.uk uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl) FJ1200, (in bits) CCM130 (need sharpening) Atonal apples and amplified heat available now!

	#5
Christofire	Re: OT: Haunted PC On Aug 3, 6:06 pm, Rope <s...@ukrm.net> wrote: > In article <%xMsi.248067$LL7.140...@fe08.news.easynews.com> , Catman > wrote: > > > SO how does a dodgy power supply boot the PC, then? > > Dunno, but Ross had a job for a while at a firm which took on Packard > Bell PC warranty returns - they were supposed to identify the problem > components, replace, certify OK and they were sold on much cheapness[1] > > He reports that quite frequently a particularly awkward machine would > be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics, > HDD & re-install, PSU, even case, resulting in a completely new > machine, which would still not work - at which point the techie[2] > would slap a sticker on it saying, simply, "ghost", and pass it on to > the next shift as SEP. If there's a broken bit (e.g. PSU) in the first machine that then fries the CPU, you could end up creating new problems with each component swap.

	#6
Wicked Uncle Nigel	Re: OT: Haunted PC Using the patented Mavis Beacon "Hunt&Peck" Technique, Christofire <chris@ukrm.org> typed >On Aug 3, 6:06 pm, Rope <s...@ukrm.net> wrote: >> In article <%xMsi.248067$LL7.140...@fe08.news.easynews.com> , Catman >> wrote: >> >> > SO how does a dodgy power supply boot the PC, then? >> >> Dunno, but Ross had a job for a while at a firm which took on Packard >> Bell PC warranty returns - they were supposed to identify the problem >> components, replace, certify OK and they were sold on much cheapness[1] >> >> He reports that quite frequently a particularly awkward machine would >> be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics, >> HDD & re-install, PSU, even case, resulting in a completely new >> machine, which would still not work - at which point the techie[2] >> would slap a sticker on it saying, simply, "ghost", and pass it on to >> the next shift as SEP. > >If there's a broken bit (e.g. PSU) in the first machine that then >fries the CPU, you could end up creating new problems with each >component swap. Quite. That's the problem when you decide that an "expensive" technician can be replaced be a nice "cheap" board-swapper. -- Wicked Uncle Nigel - "He's hopeless, but he's honest" WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41 SBS#39 OMF#6 Enfield 500 Curry House Racer "The Basmati Rice Burner", Honda GL1000K2 (Fallen apart) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big" Suzuki TS250 "The Africa Single" Honda ST1100 wiv trailer Norton 850 Commando Kawasaki GTR1400

	#7
Bear	Re: OT: Haunted PC In article <$52Q91w5C7sGJAfv@rcav8r.demon.co.uk>, Wicked Uncle Nigel says... > Using the patented Mavis Beacon "Hunt&Peck" Technique, Christofire > <chris@ukrm.org> typed > >On Aug 3, 6:06 pm, Rope <s...@ukrm.net> wrote: > >> In article <%xMsi.248067$LL7.140...@fe08.news.easynews.com> , Catman > >> wrote: > >> > >> > SO how does a dodgy power supply boot the PC, then? > >> > >> Dunno, but Ross had a job for a while at a firm which took on Packard > >> Bell PC warranty returns - they were supposed to identify the problem > >> components, replace, certify OK and they were sold on much cheapness[1] > >> > >> He reports that quite frequently a particularly awkward machine would > >> be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics, > >> HDD & re-install, PSU, even case, resulting in a completely new > >> machine, which would still not work - at which point the techie[2] > >> would slap a sticker on it saying, simply, "ghost", and pass it on to > >> the next shift as SEP. > > > >If there's a broken bit (e.g. PSU) in the first machine that then > >fries the CPU, you could end up creating new problems with each > >component swap. > > Quite. That's the problem when you decide that an "expensive" technician > can be replaced be a nice "cheap" board-swapper. Blessed are the 2nd generation self employed computer consultants. -- Bear

	#8
Rope	Re: OT: Haunted PC Bear wrote: > Blessed are the 2nd generation self employed computer consultants. From someone who works with NHS IT? -- Rob_P UKRM(at)indqualtec.co.uk uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl) FJ1200, (in bits) CCM130 (need sharpening) Atonal apples and amplified heat available now!

	#9
Grimly Curmudgeon	Re: OT: Haunted PC We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Rope <spam@ukrm.net> saying something like: >In article <%xMsi.248067$LL7.140059@fe08.news.easynews.com> , Catman >wrote: >> SO how does a dodgy power supply boot the PC, then? > >Dunno, but Ross had a job for a while at a firm which took on Packard >Bell PC warranty returns - they were supposed to identify the problem >components, replace, certify OK and they were sold on much cheapness[1] > >He reports that quite frequently a particularly awkward machine would >be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics, >HDD & re-install, PSU, even case, resulting in a completely new >machine, which would still not work - at which point the techie[2] >would slap a sticker on it saying, simply, "ghost", and pass it on to >the next shift as SEP. PB have always been rubbish though. It surprises me not that cheap POS like them give bother. -- Dave GS850x2 XS650 SE6a Teach a man to fish and he and his pikey mates will have the river cleaned out in a day.

	#10
Catman	Re: OT: Haunted PC Rope wrote: > In article <%xMsi.248067$LL7.140059@fe08.news.easynews.com> , Catman > wrote: >> SO how does a dodgy power supply boot the PC, then? > > Dunno, but Ross had a job for a while at a firm which took on Packard > Bell PC warranty returns - they were supposed to identify the problem > components, replace, certify OK and they were sold on much cheapness[1] > > He reports that quite frequently a particularly awkward machine would > be gradually re-built, starting with RAM, then CPU, hen MoBo, Graphics, > HDD & re-install, PSU, even case, resulting in a completely new > machine, which would still not work - at which point the techie[2] > would slap a sticker on it saying, simply, "ghost", and pass it on to > the next shift as SEP. Why does this not surprise me. Been using PCs too long I spose -- Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk

	#11
Catman	Re: OT: Haunted PC Cab wrote: > Catman wrote: > > >> Swapped the PSU and it's suddenly all fine. >> >> SO how does a dodgy power supply boot the PC, then? > > Dentrite growth. > Do you think I stopped it in time, or do I have Skynet in my office? -- Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk

	#12
Brownz \(Mobile\)	Re: Haunted PC Catman wrote: > So my desktop windows machine started turning itself on, with no > intervention. > > WOL off, wake on USB off, wake on mouse off, wake on keyboard off, > wake on power on off. > > Wake on anything off. > > Came up completely randomly. Got to the point where I turned it off > at the power supply. Which was fine until the next morning. Turned > the switch back on but the damned thing would not start up. > > Until I left the room....... > > Whereupon it booted itself. > > So I just left it running until today and started serious > troubleshooting. USB was suspicious as the hub and card reader were > not functioning. All cables secure, fans OK. > > No better. > > Swapped the PSU and it's suddenly all fine. > > SO how does a dodgy power supply boot the PC, then? Something amiss in the PS_ON circuit. Loose component / dry joint / damaged supply wire. Page 26 - http://www.formfactors.org/developer...DG_rev_1_1.pdf -- Cheerz - Brownz http://www.brownz.org/

	#13
w_tom	Re: OT: Haunted PC On Aug 3, 4:50 pm, Catman <cat...@rustcuore-sportivo.co.uk> wrote: > Swapped the PSU and it's suddenly all fine. > > SO how does a dodgypower supplyboot the PC, then? Long list of reasons. First, did you know a power supply is only one component of a power supply system? If not, then a computer tech would never understand this problem. Second, power supply must provide power constantly to the power supply controller. Not just power, but power within certain numbers. Too much ripple voltage may trigger the power supply controller which in term powers on supply. Just one example. Leakage on power switch. Threshold for the Power On circuit too low. Or pullup resistor defective or too undersized for the power supply. Unfortunately, too many techs no longer know how to follow the evidence. Instead they just swap parts until something works. Even that does not prove the problem is solved. Just another reason why some systems appear haunted. Demonstrates are many who really do not know how a computer works but somehow know how to fix it. For example, a power supply must not damage anything in a computer - a standard from even 30+ years ago. A CPU is even harder to harm. Still someone posted a dodgy power supply frying a CPU? Nonsense traceable to a shortage of technical knowledge. A+ Certified computer techs need not even know how electricity works to become a certified 'computer expert'. That human problem is more often the reason for a 'haunted' computer. It would be an electrical problem. How many techs even know how to use an oscilloscope or know what each wire between motherboard and power supply does. Most all do not know any of that and will be angry that they should know such simple concepts.

	#14
gomez	Re: OT: Haunted PC On Fri, 03 Aug 2007 20:50:03 GMT, Catman <catman@rustcuore-sportivo.co.uk> dropped the following oil-slick: >So my desktop windows machine started turning itself on, with no >intervention. > : >Came up completely randomly. Got to the point where I turned it off at >the power supply. I am surprised that people do not do this anyway. Unless you want the computer on as a server or doing unattended work of course. -- gomez Honda TransAlp,KTM 640LC Enduro (For Sale) (not is not to reply) "The best tool for the job is the hammer thats nearest to hand"

	#15
Catman	Re: OT: Haunted PC gomez wrote: > On Fri, 03 Aug 2007 20:50:03 GMT, Catman > <catman@rustcuore-sportivo.co.uk> dropped the following oil-slick: > >> So my desktop windows machine started turning itself on, with no >> intervention. >> > : > >> Came up completely randomly. Got to the point where I turned it off at >> the power supply. > > I am surprised that people do not do this anyway. Unless you want the > computer on as a server or doing unattended work of course. I sometimes need to WOL it -- Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf 156 V6 2.5 S2 Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk