I purchased all the parts needed for a decent gaming pc system: ASUS P4P800 SE Motherboard - (AGP 8x) Pentium 4 3.0e Prescott Intel CPU, socket 478 eVGA eGeforce 6600gt AGP 8x, 128-bit, 128mb CORSAIR XMS DDR400 (PC3200) 2x 512mb RAM Memory dual mode Random Brand Memory of 256mb extra Seagate 200gb IDE HDD ASPIRE 550 Watt PSU Water-Cooled with Thermaltake BigWater Kit Now, heres the deal. When I ordered everything, I originally ordered a XFX Geforce 6800gt AGP 8x VGA Card, but it was all artifacting and locking up/rebooting within 2 seconds of gameplay or something. It wasnt pretty, so I RMA'ed it and got a refund, so I purchased the eVGA Geforce 6600gt instead to save money. When I put this in (which was about the beginning of summer) I think...THINK...but Im sure, that I played FarCry and beat it on my PC, then I played some multiplayer in Call of Duty and had fun in that. Now, somewhere down the line, Call of Duty during multiplayer, a pop up came up saying that the game was shut down the wrong way and the colors are all nasty looking and weird, and it locks up and reboots during multiplayer now. Then I go to try FarCry, it doesnt even get to the menu and locks up and reboots also. I reformatted multiple times to no avail. My brother has the exact same motherboard as me, and his games run perfect. Now, I bought Doom 3 about a month ago and everything runs just great! Its like perfect, but everytime I reinstall FarCry and Call of Duty, it still does the same crap. I just bought F.E.A.R. the cd version today. Installed on my PC, and it locks up before getting to the menu then it reboots. This pissed me off so much. I played it on my brothers PC and it runs great. WHAT IS WRONG WITH MY PC??!! My best best best guess is its the motherboards AGP slot or the board itself. Idk if its the graphic card or voltages from PSU, I have no idea. I contacted ASUS about it and they dont reply. I am seriously thinking about upgrading to a SLI board and going to AMD but in order for that, I'd have to spend about $1000 including a CPU, board, and a 7800gtx Video Card. I dont want to spend that much now. I cant take back the motherboard and get a new one bc I through out the box, and I cut the cpu bracket off bc I had a hard time getting it off so I could install my waterblock from my water-cooling kit. So I dont think they will take that back. In fact, I through all the boxes away from all the parts I have, but I did keep the cd's and manuals for them though. I need your best suggestions and help, because this has been going on since the beginning of summer and I really really really want to play games on my pc instead of bringing my keyboard/mouse to my bros pc or his tower to my room. Too time consuming. I tried to look at drivers and bios on ASUS, but nothing seemed to catch my eye about my problem. I looked through my bios, and Im no expert, but I didnt see anything in there either. Please help and I would seriously appreciate it.