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Power supply 'issues'?

 
 
Mr Bond
Guest
Posts: n/a
 
      08-17-2004
Hi,

My computer started randomly rebooting yesterday evening. I went
through the ususal process of making sure everything was plugged in
okay, and that everything was at a normal temperature. I also did a
spyware and antivirus scan.

Some of the time it would make it into windows, other times it
wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
install of XP with SP2. I followed some advice in one of the online
forums about disabling system restart at critical failure (or whatever
the proper words are) relating to SP2 after the problem emerged. No
joy. It had been running fine for about a week after the install.

One thing I think is reasonably wierd, that I can't find advice on, is
that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
The PSU is an 350W Enermax, which was expensive at the time, but about
3 years old.

Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
reboots. I have since moved this further down to 100mhz. It seems to
stay up for a little while longer now. Over voltaging the CPU
slightly didn't help. I don't usually overclock/over voltage it.

I've also tried removing all unessasary components. No joy.

Thanks for your advice!
 
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Patrick Dunford
Guest
Posts: n/a
 
      08-17-2004
In article <(E-Mail Removed)> in nz.comp on
Wed, 18 Aug 2004 09:50:37 +1200, Mr Bond <(E-Mail Removed)> says...
> Hi,
>
> My computer started randomly rebooting yesterday evening. I went
> through the ususal process of making sure everything was plugged in
> okay, and that everything was at a normal temperature. I also did a
> spyware and antivirus scan.
>
> Some of the time it would make it into windows, other times it
> wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
> install of XP with SP2. I followed some advice in one of the online
> forums about disabling system restart at critical failure (or whatever
> the proper words are) relating to SP2 after the problem emerged. No
> joy. It had been running fine for about a week after the install.
>
> One thing I think is reasonably wierd, that I can't find advice on, is
> that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
> 4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
> The PSU is an 350W Enermax, which was expensive at the time, but about
> 3 years old.


If you want to be sure, get a digital multimeter and measure the 5V on
one of the drive connectors and also the 12V while you're at it.

Then if it is reading low, disconnect as many peripherals that use the 5V
as possible, and see if it comes up and/or the system becomes more
reliable.

I just worked on a system that would seemingly start up but would not
post, or would just hang while going, cause was found to be one faulty
pin of the ATX power plug that was intermittent, turned out to be the
12V. 5V is very important for the CPU and other chips, usually.

> Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
> reboots. I have since moved this further down to 100mhz. It seems to
> stay up for a little while longer now. Over voltaging the CPU
> slightly didn't help. I don't usually overclock/over voltage it.


Dropping the speed may reduce power supply load.

 
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Karen Parker
Guest
Posts: n/a
 
      08-17-2004
On Wed, 18 Aug 2004 09:50:37 +1200, Mr Bond <(E-Mail Removed)> wrote:

>Hi,
>
>My computer started randomly rebooting yesterday evening. I went
>through the ususal process of making sure everything was plugged in
>okay, and that everything was at a normal temperature. I also did a
>spyware and antivirus scan.
>
>Some of the time it would make it into windows, other times it
>wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
>install of XP with SP2. I followed some advice in one of the online
>forums about disabling system restart at critical failure (or whatever
>the proper words are) relating to SP2 after the problem emerged. No
>joy. It had been running fine for about a week after the install.
>
>One thing I think is reasonably wierd, that I can't find advice on, is
>that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
>4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
>The PSU is an 350W Enermax, which was expensive at the time, but about
>3 years old.





Only use a Digital Voltmeter, Board monitor programs are not reliable at all,
I have tried 3 and all give different readings..

>Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
>reboots. I have since moved this further down to 100mhz. It seems to
>stay up for a little while longer now. Over voltaging the CPU
>slightly didn't help. I don't usually overclock/over voltage it.
>
>I've also tried removing all unessasary components. No joy.
>
>Thanks for your advice!




Plus Please try this

http://www.memtest86.com/


or this

http://www.simmtester.com/page/products/doc/docinfo.asp


As faulty Ram can give the same problems..

You do need to run it over night, if it does not show up on the first pass.




 
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Mr Bond
Guest
Posts: n/a
 
      08-17-2004
On Wed, 18 Aug 2004 10:16:38 +1200, Karen Parker
<(E-Mail Removed) wrote:

>On Wed, 18 Aug 2004 09:50:37 +1200, Mr Bond <(E-Mail Removed)> wrote:
>
>>Hi,
>>
>>My computer started randomly rebooting yesterday evening. I went
>>through the ususal process of making sure everything was plugged in
>>okay, and that everything was at a normal temperature. I also did a
>>spyware and antivirus scan.
>>
>>Some of the time it would make it into windows, other times it
>>wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
>>install of XP with SP2. I followed some advice in one of the online
>>forums about disabling system restart at critical failure (or whatever
>>the proper words are) relating to SP2 after the problem emerged. No
>>joy. It had been running fine for about a week after the install.
>>
>>One thing I think is reasonably wierd, that I can't find advice on, is
>>that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
>>4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
>>The PSU is an 350W Enermax, which was expensive at the time, but about
>>3 years old.

>
>Only use a Digital Voltmeter, Board monitor programs are not reliable at all,
>I have tried 3 and all give different readings..
>
>>Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
>>reboots. I have since moved this further down to 100mhz. It seems to
>>stay up for a little while longer now. Over voltaging the CPU
>>slightly didn't help. I don't usually overclock/over voltage it.
>>
>>I've also tried removing all unessasary components. No joy.
>>
>>Thanks for your advice!

>
>
>
>Plus Please try this
>
>http://www.memtest86.com/
>
>
>or this
>
>http://www.simmtester.com/page/products/doc/docinfo.asp
>
>
>As faulty Ram can give the same problems..
>
>You do need to run it over night, if it does not show up on the first pass.


Thanks for the quick responses. I don't think my computer will last
'up' overnight. Even with the 100mhz FSB it's only good for about
10-15 minutes. At 166mhz I'm lucky if I can get to the windows start
up screen.

I don't have access to a multimetre, let alone know how to use one! I
should be able to organise a PSU to try as a replacement. In the
least it should show whether a second PSU has it's 5V reporting below
5V in the bios.

Hmmm, 5V is for supplying the CPU. Some of the first crashes happened
while I was playing Colin McRae 4. It isn't hugely intensive, but it
probably does run the CPU pretty high.

If the PSU doesn't work I'll try to get through some of the memory
tests.
 
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Dave - Dave.net.nz
Guest
Posts: n/a
 
      08-17-2004
Karen Parker wrote:
> Plus Please try this
> http://www.memtest86.com/
> or this
> http://www.simmtester.com/page/products/doc/docinfo.asp
> As faulty Ram can give the same problems..
> You do need to run it over night, if it does not show up on the first pass.


To me it looks like either Ram or PSU...

--
Dave Hall
http://www.dave.net.nz
 
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Karen Parker
Guest
Posts: n/a
 
      08-17-2004
On Wed, 18 Aug 2004 10:38:03 +1200, Mr Bond <(E-Mail Removed)> wrote:

>On Wed, 18 Aug 2004 10:16:38 +1200, Karen Parker
><(E-Mail Removed) wrote:
>
>>On Wed, 18 Aug 2004 09:50:37 +1200, Mr Bond <(E-Mail Removed)> wrote:
>>
>>>Hi,
>>>
>>>My computer started randomly rebooting yesterday evening. I went
>>>through the ususal process of making sure everything was plugged in
>>>okay, and that everything was at a normal temperature. I also did a
>>>spyware and antivirus scan.
>>>
>>>Some of the time it would make it into windows, other times it
>>>wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
>>>install of XP with SP2. I followed some advice in one of the online
>>>forums about disabling system restart at critical failure (or whatever
>>>the proper words are) relating to SP2 after the problem emerged. No
>>>joy. It had been running fine for about a week after the install.
>>>
>>>One thing I think is reasonably wierd, that I can't find advice on, is
>>>that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
>>>4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
>>>The PSU is an 350W Enermax, which was expensive at the time, but about
>>>3 years old.

>>
>>Only use a Digital Voltmeter, Board monitor programs are not reliable at all,
>>I have tried 3 and all give different readings..
>>
>>>Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
>>>reboots. I have since moved this further down to 100mhz. It seems to
>>>stay up for a little while longer now. Over voltaging the CPU
>>>slightly didn't help. I don't usually overclock/over voltage it.
>>>
>>>I've also tried removing all unessasary components. No joy.
>>>
>>>Thanks for your advice!

>>
>>
>>
>>Plus Please try this
>>
>>http://www.memtest86.com/
>>
>>
>>or this
>>
>>http://www.simmtester.com/page/products/doc/docinfo.asp
>>
>>
>>As faulty Ram can give the same problems..
>>
>>You do need to run it over night, if it does not show up on the first pass.

>
>Thanks for the quick responses. I don't think my computer will last
>'up' overnight. Even with the 100mhz FSB it's only good for about
>10-15 minutes. At 166mhz I'm lucky if I can get to the windows start
>up screen.
>
>I don't have access to a multimetre, let alone know how to use one! I
>should be able to organise a PSU to try as a replacement. In the
>least it should show whether a second PSU has it's 5V reporting below
>5V in the bios.
>
>Hmmm, 5V is for supplying the CPU. Some of the first crashes happened
>while I was playing Colin McRae 4. It isn't hugely intensive, but it
>probably does run the CPU pretty high.
>
>If the PSU doesn't work I'll try to get through some of the memory
>tests.




These Ram tests ONLY Run Under DOS, they produce there own Boot Floppy.


 
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~misfit~
Guest
Posts: n/a
 
      08-18-2004
Mr Bond wrote:
> Hi,
>
> My computer started randomly rebooting yesterday evening. I went
> through the ususal process of making sure everything was plugged in
> okay, and that everything was at a normal temperature. I also did a
> spyware and antivirus scan.
>
> Some of the time it would make it into windows, other times it
> wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
> install of XP with SP2. I followed some advice in one of the online
> forums about disabling system restart at critical failure (or whatever
> the proper words are) relating to SP2 after the problem emerged. No
> joy. It had been running fine for about a week after the install.
>
> One thing I think is reasonably wierd, that I can't find advice on, is
> that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
> 4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
> The PSU is an 350W Enermax, which was expensive at the time, but about
> 3 years old.
>
> Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
> reboots. I have since moved this further down to 100mhz. It seems to
> stay up for a little while longer now. Over voltaging the CPU
> slightly didn't help. I don't usually overclock/over voltage it.
>
> I've also tried removing all unessasary components. No joy.
>
> Thanks for your advice!


For sure sounds like insufficient power to the CPU. I take it you don't have
a little four-pin square connector going from the PSU to the mobo? If you do
the CPU runs off the 12v rail, if you don't it runs off the 5v. I think your
CPU is pulling (or trying to) more power on the 5v rail than the PSU can
supply.
--
~misfit~


 
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Andrew Bryson
Guest
Posts: n/a
 
      08-18-2004
"Mr Bond" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...

> Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
> reboots. I have since moved this further down to 100mhz. It seems to
> stay up for a little while longer now. Over voltaging the CPU
> slightly didn't help. I don't usually overclock/over voltage it.


Since other people have commented on the RAM and PSU I will ignore those for
now. One thing I would recommend checking is the CPU temperature. I have
found that Athlon XP processors can cause spontaneous system reboot when
they reach a little as 64'C. Check the CPU temperature in the bios. Also
check that the cooler is attached properly, can (and does) spin freely and
that the fins on the heatsink are not clogged up with dust.

That said, it is most likely the PSU or RAM .

Andrew Bryson
http://www.bryson.co.nz


 
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Mr Bond
Guest
Posts: n/a
 
      08-18-2004
On Wed, 18 Aug 2004 13:17:49 +1200, "Andrew Bryson"
<(E-Mail Removed)> wrote:

>"Mr Bond" <(E-Mail Removed)> wrote in message
>news:(E-Mail Removed).. .
>
>> Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
>> reboots. I have since moved this further down to 100mhz. It seems to
>> stay up for a little while longer now. Over voltaging the CPU
>> slightly didn't help. I don't usually overclock/over voltage it.

>
>Since other people have commented on the RAM and PSU I will ignore those for
>now. One thing I would recommend checking is the CPU temperature. I have
>found that Athlon XP processors can cause spontaneous system reboot when
>they reach a little as 64'C. Check the CPU temperature in the bios. Also
>check that the cooler is attached properly, can (and does) spin freely and
>that the fins on the heatsink are not clogged up with dust.
>
>That said, it is most likely the PSU or RAM .
>
>Andrew Bryson
>http://www.bryson.co.nz
>


Thanks for the fresh view . It got as low as 32 degrees when it
was down at 100 fsb. Damn cold last night too. Pretty sure the heat
thing isn't it.
 
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Mr Bond
Guest
Posts: n/a
 
      08-18-2004
On Wed, 18 Aug 2004 13:12:27 +1200, "~misfit~"
<(E-Mail Removed)> wrote:

>Mr Bond wrote:
>> Hi,
>>
>> My computer started randomly rebooting yesterday evening. I went
>> through the ususal process of making sure everything was plugged in
>> okay, and that everything was at a normal temperature. I also did a
>> spyware and antivirus scan.
>>
>> Some of the time it would make it into windows, other times it
>> wouldn't get there. My system is a 2500XP, 1gig ram, with a recent
>> install of XP with SP2. I followed some advice in one of the online
>> forums about disabling system restart at critical failure (or whatever
>> the proper words are) relating to SP2 after the problem emerged. No
>> joy. It had been running fine for about a week after the install.
>>
>> One thing I think is reasonably wierd, that I can't find advice on, is
>> that in my Bios the hardware monitor (Asus A7N8x) reports the 5V to be
>> 4.2V-ish. The 3.3V and 12V look about normal. Is this the problem?
>> The PSU is an 350W Enermax, which was expensive at the time, but about
>> 3 years old.
>>
>> Initially moving the FSB down to 133mhz (from 166mhz) prolonged the
>> reboots. I have since moved this further down to 100mhz. It seems to
>> stay up for a little while longer now. Over voltaging the CPU
>> slightly didn't help. I don't usually overclock/over voltage it.
>>
>> I've also tried removing all unessasary components. No joy.
>>
>> Thanks for your advice!

>
>For sure sounds like insufficient power to the CPU. I take it you don't have
>a little four-pin square connector going from the PSU to the mobo? If you do
>the CPU runs off the 12v rail, if you don't it runs off the 5v. I think your
>CPU is pulling (or trying to) more power on the 5v rail than the PSU can
>supply.


No, my PSU has the connector, but my motherboard doesn't use it. I
had assumed the connector a P4 thing.

Best I think I can do for now is try a different PSU, and if that
doesn't help try and keep it going long enough to get the ram checks
working. It was hard enough getting through the Virus and Spyware
scans!
 
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