MacBook will not Power Down / Restart (Or Update)

Hello Guys,
For some bizzare reason my Mac wont restart or update, not to sure when the problem started as I normally just put it into sleep!
But basically when I click update it says the updates need the Mac to be restarted, I click ok. It basically logs out and goes to the Username screen to login.
Same story when trying to restart/shutdown; just goes to the login screen.
I'm tempted to do a OS Wipe and start Fresh! However it's going to take 3 hours to download the latest OS! Patients isn't my strongest point haha!
Any suggestions/ideas would be brilliant!
Many Thanks,
Jac

Jac ..
Try Starting up in Safe Mode. A Safe Mode boot takes much longer than a normal boot so you do need patient.
A Safe Mode boot deletes system caches that may help. Once you see the Desktop, click the Apple menu icon top left corner of the screen. From the drop down menu click Restart.
If that didn't work, you need to Lion Recovery to repair the startup disk if necessary, or reintall the Mac OS X.
For download connection speed information see: Requirements for reinstalling OS X Lion at that link.
Reinstalling OS X Lion via Lion Recovery requires broadband access to the Internet via Wi-Fi or an Ethernet connection.

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