Are you asking about HP Pavilion dv6000 notebook?
1. Could be memory failure. Try removing memory one by one.
2. If it's not bad memory, most likely this is known GPU failure.
You can try fixing (temporarily) the GPU problem using this trick:
Fisrt check this things.
Turn on your pc,listen carefully for any bips or in the other case for blinks of the caps lock led and num lock led,if any tell me how many bips or blinks of the were(note:it may happen that the blinks most probabily in the case of ur model will be 2 flashes or one flash and one long onein anycase pay atention to them)
After this check to see or listen if ur hdd is workin so u can understant if the OS is being Started up or not,,
If by anychance u have cheked all this u have cheked or skped all this and u are sure that the OS is stardet and the pc works but u cant see a thing connect ur notebook with screen of another pc with the aposite cable and try hitin Fn+F5 to see if the screen turns on if not so from the begening of the conection.
If does not solve write me ur feedback of the operations so i can help u more
Rose, not sure if this is still an issue. check on http://www.ifixit.com/Answers/View/33368... and it explains in detail what might be happening to your computer as well in how to possible fix it. and its free so you do not have to pay me or anyone else one here:)Sorry Dan, could not resist.
Chiming in here, after dropping any laptop, I would check that the board is still intact. I would also check that the connection between the lcd and the board is still intact, and that the case isn't broken anywhere. In every case I've had of a dropped laptop, there was either a broken case or motherboard or both.