Windows 7 keeps restarting after shutdown?

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Just built a PC, installed Windows 7. Every time I click shutdown from the start menu it turns off then boots right back up. Any ideas on whats going on, is something wrong with the PC? It wasn't doing this a few days ago. It just recently started doing it. I first noticed that in the morning that my PC was on even thought the night before I turned it off. Then I tried shutting it down tonight and it just basically restarts instead.

Any idea?

Please help.

Thanks!

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

References pcpartpicker.com/forums/topic/64409-windows-7-keeps-restarting-after-shutdown

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