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'[EE] XP PRO - Is hard drive going bad?? Probably n'
2007\09\27@120355 by Robert Rolf

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This sort of 'need to reset to boot' is typically caused by a failing
power supply. The "DC OK" line is taking too long to come up, or there is too
much ripple on one of the power lines due to bad capacitors. (A P4 is the
right vintage for this).

It could also be capacitors failing on the mother board.
Lots of bad capacitors on P4 motherboards because of a stolen formula
that was missing a key ingredient. (around 2004)
Google for "bad capacitors" motherboard for lots of links explaining the issue.

http://en.wikipedia.org/wiki/Capacitor_plague

http://www.badcaps.net/pages.php?vid=5
http://www.badcaps.net/


I had replaced the caps on my MB, but it didn't help. But changing out the PSU,
completely fixed my problem of 'reset to boot'.

Robert

Carl Denk wrote:
{Quote hidden}

>>>--

2007\09\27@122513 by Carl Denk

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Power supply was replaced around 4 months ago, that doesn't mean it's
OK. The bottom of the power supply runs fairly warm (borders on hot),
Several weeks ago, I replaced the P4 heatsink/fan due to noise problems.
The new fan pulls more air from the PSU side and the P4 runs hotter,
near Intel's active monitoring limit. I still have the previous PSU, and
can probably will install it, and see what happens. If the mother board
cap's were bulging, I think I would have noticed it while replacing the
heat sink.

Can anyone suggest a good USA made PSU?

Robert Rolf wrote:
{Quote hidden}

2007\09\27@122807 by Carl Denk

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Incidently, the Intel motherboard is made in Ireland.

Robert Rolf wrote:
{Quote hidden}

2007\09\27@125832 by John Chung

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Yes any Linux Live CD would work. If you have seen the
caps on the motherboard bulging then it will be a
problem.... Anyway you still have to isolate the
problem*mobo, PSU or hard disk*.  PSU just use a meter
to test the supplied voltage under load. Hard disk
just place it into another PC. mobo is tricky... I
would start with LIVE CD first.

John


--- Carl Denk <.....cdenkKILLspamspam.....alltel.net> wrote:

{Quote hidden}

>

2007\09\27@153820 by Robert Rolf

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John Chung wrote:

> Yes any Linux Live CD would work. If you have seen the
> caps on the motherboard bulging then it will be a
> problem.... Anyway you still have to isolate the
> problem*mobo, PSU or hard disk*.  PSU just use a meter
> to test the supplied voltage under load.

Not good enough. You need a scope to see the 24 kHz ripple.
It was nearly 2 V p-p, but the average voltage was correct.

> Hard disk
> just place it into another PC.

But ONLY as a slave device for reading.
If you try to boot on it, you run the risk of really messing up the
windows registry as it tries to reconfigure the machine for
the different chip sets it will find.
Been there, did that, won't do it again.

You can buy an external USB to IDE converter cable for around $40.
Bytecc BT-200

>mobo is tricky... I
> would start with LIVE CD first.

Good way to get him started on the path to Linux ;-).

R

2007\09\27@160009 by Carl Denk

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Have Umbuntu up and running dual boot with XP home on daughter's old P4
machine. Need some time to get Wine up and play with a bit, where if I
mess up, nothing lost. Want to move in the direction of the Penguin,
weather will be closing in here (Northern Ohio, USA) in a month, will
have time then.

Robert Rolf wrote:
{Quote hidden}

2007\09\27@204901 by John Chung

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> >  
> >> mobo is tricky... I
> >> would start with LIVE CD first.
> >>    
> >
> > Good way to get him started on the path to Linux
> ;-).
> >
> > R
> >
   It is funny you said that :P I am a BSD guy.. Drat
I did not promote my love! :( Anyway Linux is
sufficient for this purpose.

John


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2007\09\27@205305 by John Chung

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--- Robert Rolf <Robert.Rolfspamspam_OUTualberta.ca> wrote:

>
> John Chung wrote:
>
> > Yes any Linux Live CD would work. If you have seen
> the
> > caps on the motherboard bulging then it will be a
> > problem.... Anyway you still have to isolate the
> > problem*mobo, PSU or hard disk*.  PSU just use a
> meter
> > to test the supplied voltage under load.
>
> Not good enough. You need a scope to see the 24 kHz
> ripple.
> It was nearly 2 V p-p, but the average voltage was
> correct.
>
 2Vp-p? Hmm I need to bring out my scope from
storage. Looks like I need to study this. Thanks for
the info! You are right about the avg voltage. Love my
DMM over the scope........

John


     
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