OK, ive just built a new PC, heres the specs 500W PSU 120GB HDD 40GB HDD Creative Sound Blaster Live! AMD Athlon 64 3000+ Sparkle NVidia 6600GT 512Mb RAM Im having a problem. Games have just started crashing on me, battlefield 2 used to work fine, now i can play it for a minute or two, then it crashes my computer completely (not to desktop, it does a straight restart). This is the same with 3DMark05. Again, it used to work fine. I dont think its an overheating issue, although i have no sure way of finding out. Also, i have recently re-installed directX 9 (these problems seem to have been occouring since installing UT2k4), but reinstalling DX9 doesnt seem to have helped the problem. Any ideas would be welcome.