Let's begin with my hardware: Intel Q9650 - 3ghz (less than a year old) Asus P5N - D Motherboard (less than a year old) 4GB DDR2 800mhz (about two years old) GTX 550 ti x2 in SLI Alienware 750w Power Supply 1 x 220gb 7200RPM HDD (Contains windows) 2x 500GB 7200RPM in Raid for a 1TB drive Corsair H60 heat sink. Case Haf-X 942 So I got a virus a few days ago. AVG "Supposedly" cleaned it up. Afterwards, any time I tried to open anything it said <file name>.exe can not be located. Was going to run AVG again, but instead decided to make sure it was fully updated so I updated it and it required a restart... After I restarted it, it would get past the Windows 7 logo screen... stay black for about 30 secs, then an extremely quick blue screen (unable to read was on it), auto restart and repeat the cycle. Steps I've taken to try and resolve: I took out my 220GB hard drive and replaced it with a working 500GB hard drive with windows xp. (While I realize it won't have my motherboard's drivers, gpu drivers or anything on it, they wouldn't keep it from booting). It gets to the windows xp logo screen, and right after blue screens, auto restarts and repeats the cycle. I unplugged power to the two raid drives, to the CD/DVD Rom, I unplugged all sata and IDE cords from the motherboard... I also took out one stick of ram leaving just one other in. Started up, same thing. I swapped out the sticks of ram... same thing. Sum it up: Regardless of the ram, what hard drive, what OS, what all I have connected to the motherboard/power supply, it refuses to boot up. Suggestions?