It's just a case fan. 1200mm, mounted for rear exhaust. I have not had problems with this system untill today. Anyone know how to tell if an absoloutly blank BSOD is a hardware issue or a software one? I was talking with someone over AIM about it and they think it might be my weaksih 350watt PSU, but I have run this same fan before (mounted wrong, screws got messed up, had to find new ones and did today), and the system was fine. So I guess I'm back where I started. Any other ideas would be very much appreciated.