Comp randomly fails to boot?

[5atanic]

Ok, my computer is a bit stuffy.. after a motherboard incident my computer will suddenly either freeze or fails to boot. After switchin it off and tryin it on again after a few times it boots up properly (with Windows etc.)

I had the 'replaced' motherboard checked out and its perfectly fine, so what would be causing this? Sometimes I can play for an hour or so in games and it doesn't seem to crash. I'm suspecting it may be a power supply problem.. but my Antec should have circuit/overload protection when I kinda 'short-circuited' the board (installed a floppy disk drive while it was running).

Could RAM also be a factor too? Any suggestions would be greatly appreciated

Main Specs:
AMD XP 2500+
2xKingmax PC3200 DDR RAM
2x80GB Western Digital HDD
Antec TruePower 330 PSU
Abit NF7-S v2 Motherboard

[5atanic]

Btw, PSU readings seem to be fine as most of the voltages seem to be stable close to the designated voltage. Only the +12V seems to be a bit off.. hovering at around 11.8?

[DallasDon]

Antec is good stuff, but 330 watt may be borderline.

You didn't mention the vid card, which is also a power hog.

calculate your power use here

Also, read the manual under voltage control. It may have a manual setting to shut down if voltages vary + 10%, 15%, etc.

Try blowing the dust out of the power supply. Dust builds heat, which robs apmerage.

[5atanic]

This stuff is practically brand new though and the computer was working perfectly fine (could run for hours under full load etc.) until the short-circuit/overloading incidient and has been playing up since..