Alright, well, I've been reading posts on these forums the past day and a half, so I figure hey, let's give these guys a go, maybe they can see something I'm missing. My hardware setup: p4 3.2ghz, 1.5gb ram, ati radeon 9550 256MB(I believe it is made actually by ATI, since there are no distinguishing marks on the actual card, but I purchased it second-hand about a year ago, so I am not sure) PSU: antec 300W (let me know if I'm missing anything important...) Alright, now here for the story: I play an online game, Lineage II; and well, for the longest time I played, and I played fine, no problems, then one day I decided to reformat my computer to get rid of just the normal junk, no problems at all, just a "re-organization" reformat. So okay, reformat goes fine, all is good, I install drivers, good, good, but for some reason now in my game I cannot run it in high graphics or it lags to hell. I also notice something different reported in `dxdiag`, under the Display tab, AGP Texture Acceleration was now "Not Available", before was "Enabled". At this point I decide to mess around and install the latest graphics drivers in an attempt to fix this. I install drivers, yay, it's fixed, I can go into high graphics, but that night while I was sleeping, something must have happened... I wake up to my computer sitting at the windows logon screen. (I usually encounter this when windows update does new updates, but I had thought I turned them off...) Now for some reason at random intervals the PC black screens then reboots. (if I am watching it, the mouse, display lockup and then black screen, POST, and windows begins loading again) So I reformat (I needed to anyways, lots of spyware, and I've got enough hard drives to store all my personal files on anyways, so reformatting is simply copying 'my documents' and such to one of those and reformat), reinstall drivers, and bam... still the same issue. I've even tried loading Omega drivers (I believe the ones I had before I got brave the night before). But now no matter what drivers I use, windows still crashes randomly/immediately when I try to load my game. Now I KNOW my system runs >HOT< (it always has, even when I first built the system), it runs anywhere from 49C to 63C. But I do not believe this is an issue, since I always keep my system clear of dust and that it has adequate airflow. So I don't think my issue is heat. My powersupply is 300W, I found a website that adds up the component Wattage in computers and it recomended me 396W, but uhh... It ran fine for 3 years NO PROBLEMS, so I don't think my issue is the powersupply. Let's see... video card! ah! the video card... I've also got an ATI Radeon 9200 128MB I have in an MCE computer, so I decided I'd give that a go, and well, it >STILL< crashed, so it's probably not the video card. (I think it might just be drivers, but now there's more issues). Memory... well, I've got 2 sticks of 512MB and 2 sticks of 256MB, I took out all but one of the 512MB sticks, booted up, and the system still crashes. I then took that stick out and placed the other 512MB stick in, again... still crashes. I then did the same with the 256MB sticks and again, still crashing. (UPDATE: memtest just finished, PASS1 FAIL0 ERROR0, now I know bad memory can pass the tests, but I still don't think this is my problem) Motherboard/CPU: ....no Okay, now... I set windows to "not automatically reboot" on errors, and it shows the BSOD screen, and produces a STOP error at 0x000000F, which according to what I read is due to failed(-ing) hardware/mismatched memory/failing motherboard. I can produce minidump logfiles if needed.