Windows 7 computer restarts automatically after shutdown

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I recently built a new PC running W7 (64). When I shut it down, it appears to shut down properly, but a few seconds after it shuts down, it restarts itself. In addition, if I put it to sleep it appears to go to sleep properly, but when I return to the computer, the fans will be running on high/max speed and I will have to hold the power button down to get this to stop - but then, if I press the power button a second time, it appears to exit sleep properly. I have not had any problems or crashes while using the computer - so the problem seems to be confined to an inability to shut down / sleep.

Any help would be appreciated.

Please help.

Thanks!

I didn't find the right solution from the Internet.

References answers.microsoft.com/en-us/windows/forum/windows_7-performance/windows-7-computer-restarts-automatically-after/daeb457a-3509-4be9-a85b-2935c8c3e108

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