Problem started today. After the computer is on for about 30 minutes it reboots. Then it reboots in 15 minutes and then will do it constantly untiL I shut it down. Ive swapped all parts except CPU. But when I put in a Radeon 8500 it wouldnt boot into Windows, just kept beeping and rebooting. When I put in a Radeon 9500 it booted into Windows but then the screen turned into a mess of lines and checkerboard patterns. All 3 cards check out in my second system. Ive had this current set up for about 18 months. Ive had similar problems on other boards where a cap. was bad and the computer would reboot as soon as it got warm but never had video issues like this. Thanks.