Restarting my mac pro

My mac pro won't restart. It wont restart from the file tab. I have shut it down from the file menu, and then start it again from the power button. Anyone know what to do?

Reset the SMC.
Install a fresh copy on a newly formatted drive.
Only install Apple Updates.
You could see what happens after a Safe Boot.
For sure unplug any cables and devices other than keyboard (not that a bad keyboard or cable isn't itself the cause).
http://www.apple.com/support/macpro/

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