I have a homebrew PC with an AMD K7800 CPU. The computer has developed a problem where it will poer on for 1 second then shut down. There is no video display and no BIOS beeps. I did some trouble shooting and jumpered the PS Pins 13&14 (ATX) and the HDD's and fans came to life. I then started removing cards, ram, etc to see if they were the culprit. No caused a different reaction except the CPU. When I pulled the CPU and tried to power on, the PC acted just like I had jumpered the PS. When I put the CPU back in and try to power on it comes on for one second then shuts down. Would anyone here say this is a bad CPU? Maybe MB?