I think I've narrowed my problem down to the motherboard or CPU. I put the system together and right away had a problem trying to turn it on. I would hit the power switch and it would just flash, not turn on, this would happen for a few times. So I installed windows with no problem, I installed the video and sound card no problem, I installed BF2 no problem, Then I had problems installing BF2 SF. I checked the power supply, the 3 volt was fluctuating wildly and the 12volt line only put out 11.1 volts. So I replaced the PSU and now the comp turns on like it should. But now its unstable, When starting bf2 it would crash and give a horibly sound and the colors would be slightly off. I went ahead and removed sound card and activated onboard sound, no change, remove video card and replaced with another, no change, replaced memory, no change, ran diagnostics on hard drive, all ok. So what am I looking at? How do I tell if its a cpu problem or motherboard problem?