回复：电脑自动断电，重启困难，请问可能有什么原因？

Try this:

1. Take off the case box,
2. Take off the blow fan on top of the radiator of CPU,
3. Clean up all the dirt accumulated on the radiator (by a piece of wood stick such as a toothpick),
4. Reinstall the fan on.
5. Try to clean up every places you can access before putting back the case box on.

You may solve the problem.