pc restart suddently while working

I am having problem with a pc ( which is quite old more then 3 years)
its works fine, but suddently it will restart. ( from working moode to restarting black screen)

Operating system is windows xp.

 may be some hardware like processor or Something gets hot so it restart automaticaly, or could be powersupply making this pc restart.

but still i want 2nd opinion before put this one in scrap.


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sk_raja_rajaConnect With a Mentor Commented:
1)  Download MemTest-86 (www.memtest86.com), create the floppy, and run it for several hours (overnight would be good).   This will stress test your memory -- if it runs overnight with no errors you can safely eliminate memory as the cause.

(2)  CPU overheating is more difficult to confirm.   If you have any video-intensive tasks (a modern graphics-oriented game for example) you can play it for 30 minutes or so and see if this consistently causes a failure.   Video rendering is not graphics intensive -- it's CPU intensive -- so I really don't think this is a likely cause of yoru problem; but it could be.

(3)  Inadequate power is best tested by swapping in another -- preferably "beefier" -- power supply.  It's amazing how many intermittent issues go away with a good power supply with plenty of reserve power.

4.Finally, just to be sure you don't have a deteriorated motherboard that's contributing to these failures; give your motherboard a good once-over with a flashlight and see if there's any sign of leaking or bulging capacitors on the motherboard.

5.Also go to start<control panel<switch to classic view< power options     and make sure everything is set in a way that makes sense.  Sometimes power management settings can cause a similar problem.  It is worth taking a look just to be sure.

6.Post the event logs error messages here
eguilhermeConnect With a Mentor Commented:
have you checked the computer temp after the restart ? if its hot then it temp otherwise not..

have you tried another powersupply ? my initial guess would be for sure the powersupply, if you can try another power then i suggest you to do it
fosiul01Author Commented:
yes, i will try with another power supply. but
how will i check computer temp ??
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josaolguinConnect With a Mentor Commented:
You can cheak in the computer setup or use some software like HWMonitor or CoreTemp (all free software)
did you see a blue screen before reset?
If is the case try to cheak the memory banck, clean the contacts on the memory.
Cheak all fan's.
cheak also event viewer for possible errors.
fosiul01Author Commented:
sytem event log is clear, nother there.

do you need application event log aswell ??
yeah...post it
fosiul01Author Commented:
Ok i will post tomorrrow because office hour is now finish. so tomorrow when this will happended, i will post the application log

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