I have home built computer. It has been working fine for 6 months with case opened. I recently closed the case. The system power itself down. I rebooted and played Call of Duty2. After 20 minutes the shutdown on me. Will not reboot. I get 3 quick beeps and then 5 more beeps no picture, then the system shuts down after a few minutes. I have K8V-X SE , 1 mb ram, 550 watt psu CX -series. I do notice when booting the CPU fan seems sluggish. I did try a different PSU 450 w, no change. Any suggestions?