A year or so ago, I upgraded my computer from K6-400 to Athlon 950. I changed the motherboard, CPU, and fan. I reused the other components. However, often, while the computer is booting up, it will get part way through, beep, go black for a second, and then restart. Then it will come up with scan disk because it was not shut down properly. Sometimes, the computer starts up just fine. Other times it does that. Once in a while, it will go through the restart routine up to 5 times. Nothing seems to be hurt by it, but it is frustrating and annoying, not to mention time consuming. It NEVER did this with the old K6-400 motherboard and CPU. Any ideas? Thanks again.