Why does my 3-year old MBP shut down and not start?

I have a mid-2010 MPB running Mt Lion and it is giving me fits.  It consistently shuts down for no reason.  I have taken it to the Genius bar and been told that I should add additional memory, so I have doubled the RAM with a new unit.  The problem is that did nothing.  I keep having to restart and now it seems not to want to start at all, so I can't do anything or learn anything.  I have the basic MBP but I have 2011 Office for Mac and the other basic apps on board.  Any ideas?

Hello peterdowning
Start with the troubleshooting steps in the article below to try and resolve the start up issues.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/ts1417
Regards,
-Norm G.

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