Computer freeze - have shut down then restart...

In the last 2 month, my PC freeze with a screen glitch (lines with snow) while i'm playing my game (BF2)
- it sometimes freeze on the desctop with the screen ok or with Civ 4.

i cannot reset; only way is to shut it down then restart.
then it can work properly for awhile before it happens again.

When i start my PC, the bios sometimes give me this message:

'Overclocking failed! F1 to change setting or F2 to continue'

I tested my memory and it pass all the test.

Here is my rig:

Intel P4 3Ghz HT
Asus P4C800E-Deluxe
ATI X800XL 256Mb AGP
2x 512MB DDR400 dual channel
300 watts power supply

P.S.: i tried changing my graphic card; still having same problem. I also cleaned the eatsink of my CPU about 2 days ago (didn't freeze since, but it's a bit soon to say it is solved).

PLEASE HELP!!!
2 answers Last reply
More about computer freeze shut restart
  1. See if you can cause the problem to recur by running Prime95 in "Torture Test" mode. That should cause the CPU to max its current draw, etc.
  2. No i don't overclock.

    since i cleaned my heatsink everything works fine ( seems u where right about overheat...)

    i pumped up the graphic in BF2 to stress my rig, and everything runs smoothly...but again, il wait about a week before saying it's ok.

    what's that thing you say? that test? what it does??

    Thanks guys!!!
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