So 1st hi to all Just want to find out if any1 can help me with my problem? My pc crashes and reboots while im playing games. I think its a graphics card problem though. Ill tell you what i did now. I had a P4 for the last umteen years so it was time for an upgrade. My PC specs now are as follows: Pentium Dual core 3ghz Coolmaster CPU fan with back plate screw in 2 gigs transcend ram (2 x 1 gig) Gigabyte 7900GT 256meg SLI ready Gigabyte GA-G31M-S2L Motherboard Gigabyte 3D Aurora chassis 1 x 200 WD IDE HDD (Windows) 1 x 250 SG IDE HDD 1 x 250 SG SATA HDD AOpen 400watt PSU AOpen DVD writer 5.1 surround sound onboard So this is whats happening. I 1st noticed my front audio and mic started playing up. If the mic was pluged in it would say mic unplugged, if u put the head phones in with the mic it would say nothing connected. Anyway to sort that out i just disconnected the front jacks. Then my pc started crashing and rebooting continuously but it only happens while im playing games. I 1st thought it was overheating the cpu but ive put freash heat sink and put a cpu fan that screws on a plate behind the board.This didnt work so i thought it could be vista as i just put it on. Ive reformatted and changed from vista ultimate SP1 to XP SP3 and still it happens. I tried new board drivers and it still happens. I tried new graphics drivers but same thing. I have stripped the system back to pieces, cleaned it and put it back together as you can guess same thing. Iv updated to the latest bios F6 as well. Still the front audio doesn't work and the pc crashes in games. I am now out of ideas. Any assistance would be appreciated.