TS2999 My MacBook Pro will not start up

My MacBook will not start up, it gets as far as a grey screen with the apple logo but won't go any further

Ref:  http://support.apple.com/kb/ts2570
Go step by step and test.
http://support.apple.com/kb/ts2570
Start up in Safe Mode.
http://support.apple.com/kb/PH14204?viewlocale=en_US
Repair Disk
Steps 2 through 8
http://support.apple.com/kb/PH5836
Reset PRAM.  http://support.apple.com/kb/PH4405
http://support.apple.com/kb/ph14222
Reinstall OS X
http://support.apple.com/kb/PH10763?viewlocale=en_US

Similar Messages

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    If running 10.7 or later hold down Command-R at Startup.
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    Try reseting SMU as suggested in link below
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