Odd hardware problem???

System built about a year ago - Asus P5B; Core 2 Duo 6300; 3Gb Crucial RAM
Been working fine till a couple of months ago when it would occasionally power off then restart.
Sometimes it happens 3 times in a day, sometimes it doesn't happen for 2 weeks.
Nothing in the event log - it's as if someone pulled out the plug and stuffed it back in again but it's not a mains problem as it's on a UPS.
Ran memtest for a day - nothing. Replaced memory anyway - still happens.
Replaced PSU - still happens.

Beginning to look like an intermittant h/w problem on the mobo???

Any thoughts?? All ideas welcome!

Thanks

Steve

Being a temperature problem is high on my list. I used to have a PC with a temperature problem, and it used to just shut itself down and then restart itself. When I replaced the CPU fan, it stopped happening.

First thing I'd do, is probably look inside and check that the CPU fan is spinning, and there isn't something stuck in there to stop it from spinning.

And you can also get Core Temp to check the temperature of it.

If that checks out ok, then might have to look into the motherboard being the problem.

CPU temp is usually around 47 C. I've checked all the voltages and they are fine too
Steve

Take the side panel off , see if it keeps happening.

There it wont even cost you money :)

Could be the graphics overheating, does it shut off when gaming or just when pootling around on the web ?

Are you sure it's not the UPS itself? If it's pretty borderline in terms of output then it sounds entirely feasible.

could be heatsink, if it's disloged. if you get a chance update motherboard bios and maybe go to a slightly older version of graphics driver. newer might bring more stability or older migh as well! either way consult manufactures website for issues.

if you had a system restore point before this happened do that then you'll know if it's something thats been added after and therefore a software problem.

Quote:

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Originally Posted by Tantalus

Take the side panel off , see if it keeps happening.

There it wont even cost you money :)

Could be the graphics overheating, does it shut off when gaming or just when pootling around on the web ?

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No games - just office stuff :)
Graphics is a Matrox 650 which doesn't even get warm!

Internal case temp is running at about 34C

Quote:

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Originally Posted by this_is_gav

Are you sure it's not the UPS itself? If it's pretty borderline in terms of output then it sounds entirely feasible.

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Worth checking. I've bypassed the UPS for now and we'll see what happens.
Thanks

Quote:

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Originally Posted by freddie

could be heatsink, if it's disloged. if you get a chance update motherboard bios and maybe go to a slightly older version of graphics driver. newer might bring more stability or older migh as well! either way consult manufactures website for issues.

if you had a system restore point before this happened do that then you'll know if it's something thats been added after and therefore a software problem.

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CPU temp looks OK though at 47. BIOS is the latest.
Graphics driver hasn't changed since installation a year ago.
Will check for issues.
Thanks

Bypassing the UPS was a good idea, to check.