Grey start-up screen with status bar freezing and shutting down

Hello
I have a 13.1 MBP running 10.8.1 that is about 18 months old and when starting it up, it makes the traditional apple "ding" and then starts up with the little spinning wheel.
Then the status bar appears reminicent of when you install a firmware update and after 23 seconds, the MBP competely shuts down.
I have reset the PRAM, tried to start up from the disc, tried to start in Safe Mode and everything in between.
Nothing seems to remedy the situation.
Any thoughts would be most helpful!
Thanks!

Actually, you should hold the C key to start up from a Mac OS X install disk. Holding the D key boots into Apple Hardware Test (assuming you've got the right disc in). If both of those things fail, resulting in identical behavior, then it's likely to be a hardware issue.

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Grey start-up screen with status bar freezing and shutting down

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