AMD CPU no good for overclock!

Since 主板工作燈和風扇都正常工作, it's very likely that your CPU is burnt. I had an Athlon that only worked 0.5 hour for me before kicking the bucket without warning. And I didn't even try to overclock. I had a free replacement, which has been working fine for about a week now. Get a new CPU and see if your PC works again.