Hello group, I need your help & wisdom. I built my own computer - Antec case, Gigabyte GA7N400 motherboard, AMD Athlon XP 2400 processor, 1gig ram, ATI All-in-wonder AGP card, Sony DVD player, Sony DVD burner, 3 hard drives, Windows XP Home SP2. It was working great, then I decided to install a rear cooling fan in the case. I had an 80mm fan with a heat sensor lead on it for variable speed, connected to a power lead from the power supply. Somehow I pinched the sensor lead and when I tried to restart the computer, it would not start. So I opened the case, found the problem, repaired the sensor lead, and restarted the computer. Worked ok. Then my monitor started to go black intermittently. So I tried another monitor, worked ok, then it started going black. Opened up the case and found the cooling fan for the CPU was not working. So I changed the CPU Cooling fan. Still didn't work. Re-installed the original cooling fan, and hooked up the fan to a power lead rather than hooking it back onto the motherboard. Fan worked ok. but system still unstable. Now the question - do you believe I fried the CPU (?), the motherboard (?), both (?) or do you have any other ideas? Any help would be appreciated.