I haven't used my computer much lately so there have been no symptoms prior to this that I know of. I started it up the other day and was in the process of updating my avg antivirus. The computer froze so I restarted it with the reset. It appeared to start but the chassis fan just ran at high speed and nothing else happened. I tried several reboots with the same result. I shut it down and went back to it after an hour or so and it started up and went to the windows screen and stayed on for about a minute then it went to black screen with the fan running on high speed again and nothing else happening. I tried to reboot again and it did nothing again just the fan running. I left it off for a few hours and tried to restart it. It just showed the system information screen prior to loading windows but was frozen. I tried to enter the setup menu for the bios screen but it was just frozen. Rebooted and it just stayed black with the fan running on high again. What is my first step in diagnosing this? Thanks.
Asus M2N-SLI Deluxe, AMD 4200 X2, MSI 7600 GT, 2GB Corsair XMS DDR2 800, Creative SB live 24 bit, Samsung 16x DVD-RW, Seagate 7200.10 250GB sata 3.0 hd, Antec true power 2.0 500W ps, Antec super lanboy anodized aluminum case, Hans G 19" widescreen LCD monitor, Logitech 2.1 speakers, Microsoft wireless keyboard and mouse.