booting problems

I dropped my MacBook Pro today on the floor, and it appears to no longer load anything beyond the beginning gray screen.
It'll go to the Apple logo and spinning gray loading symbol, but won't load any further, no matter what I try.
Any suggestions?

Hard floor? The Hard Drive might be damaged. That would be my first guess anyway.

Did your MBP come with an OSX DVD? If so, put the DVD in the drive and boot holding down the C key right after the Startup sound and keep it down till you see the gray screen. Once in the installer look up top for Utilities menu. Click and click on Disk Utility. First look at the SMART status on the bottom. Does it pass or fail? If Pass run the repair disk and see what comes up.