My MacBook Pro won't boot on the Mac side I get the gray screen and then halfway through the bar loading it turns off?

My MacBook Pro was downloading apps from iTunes and I shut the computer down at my I laws house or so I thought?  When I pulled the computer out of my backpack it was still on?  I tried to login and it kept spinning so I turned it off and now I only get a gray screen.  I can boot it in the windows side and have an external hard drive with time machine backup on it but don't know how to load it without getting onto the Mac side?
Please help!

turn off the mac completely
as soon AS you hit power button press following 4 keys
Option + Command + P + R
that should reset it

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