Sorry, don't know what else to tell you. With a drop like that, a circuit may have broke, from a small crack in motherboard. May have jarred a solder joint loose. You may have to take it to a shop for service.
When you zapped the pram, how many times did you let it chime? Should let it chime 4 or 5 times, before letting go of the keys. If it didn't chime that many times, try it. May not help, but won't hurt. If you do get it to boot somehow, you should immediately run Disc First Aid, and tell it to fix any problems it finds. Even better........... if you have Norton Disk Doctor on it, run that ALSO.
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