|Open access panels, remove battery, remove and reseat memory. Remove and reseat plugs on hard drive. Replace the battery and try again.|
Run hard drive mfg's test utility (read name off drive) or use Seagate's Seatools and run off bootable CD to see if the hard drive is good. Run Memtest86 off CD as well to test your memory. If you can get into BIOS and both of these tools runs then your hardware is probably fine, it is possible that if the system was on when it was dropped then the damage was to Windows so you may need to do a start up repair. You can do this from an install disk, a repair disk (you should have made this when computer was new, you can make one from any Windows 7 machine that is the same type - 32bit or 64bit), or a recovery disk from the mfg.
You have to be a little bit crazy to keep you from going insane.