MBP won't boot since Lion install

Computer will start up fine and get to the Galaxy background screen. No icons appear, no dock but the apple/finder/edit/etc....across the ropappears. No clock either. Once the spinning ball held for about 15 inutes. I restarted by hold down the power switch and restarting. Now it just sits with the arrow pointer but nothing else happens.
Thoughts?

Hold down command-R while restarting.  That should boot you into Lion's recovery mode.  Use that to run Disk Utility and repair the hard drive (not the permissions), and then reinstall Lion over your current system.

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