Macbook Pro Lion shuts off during boot up

I have a 13" MacBook Pro purchased in 2011.  I had the internet lock up on me and hard shut down the computer.  Now when I press the power button, the machine begins to boot up and the apple pops up then the progress bar pops up and the wheels starts to spin, but the machine shuts down about 5 seconds into it. 
I have seen this problem on older posts (pre-Lion) and one solution was to hold option during start-up and then boot off th esystem restore disc, but Lion is all internet based, so no disc here.  When I do that, it pops the option to select an internet source, which I do, then the HD symbol pops up with an arrow below it.  When I clikc the arrow (which is the only apparent option) it does the same thing and shhuts off at the same point.
HELP!

Try booting with command-R. This will boot into the repair parttion. From here you can run disk utility and other programs. You can also do a repair installation of Lion which will almost certainly solve the problem. Doing so shouldn't wipe out your user data, but installing OS updates will be required.

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