Now, to the problem. I was getting random lock ups. These lock ups would become more frequent until the point where I am now; the computer won't boot, save for safe mode. I acutally had a lock up in safe mode when I was having a lot of chrome tabs up, foobar2000 playing and windows live messenger logged on and a movie playing in MPC.
I believe this could be related to the fact that I installed 2 SATA hard drives. I can't recall it occuring before, and it didn't start at once when I installed my new hard drives. But again, I can't remember it before, and that's the only hardware change I've done.
At that point I had the system, 3 SATA-drives, 1 IDE-drive (all 7.2k rpm), 2 92mm fans, 3 120mm fans.
I reinstalled Windows as to have a clean version to check for software problems. Windows booted the first time, I proceeded to install VGA drivers and reboot. It wouldn't load past the "welcome"-screen, once more. To be fair, Windows also automatically installed some drivers. Onboard sound and PCI sound card. Alas, I don't believe that to be relevant.
I've ran memtest86+ for 7 hours, no errors. I moved my graphics card to another computer (520W no brand PSU) where I've ran FurMark, it worked. I didn't really stress the card since that doesn't seem relevant at all to my errors.
so I unplugged 2 hard drives and both 92mm fans. I could reinstall windows and install drivers et.c. and get stable boots. Now 5 days later I am ONCE AGAIN seeing lockups. This time around my computer keeps functioning while the monitor is frozen, I can keep using programs like TeamSpeak to communicate with my friends, but the monitor is frozen. This has since happened twice in one day.