Cannot access BIOS, keyboard won't work...

I am the classic friend that fixes all problems concerning computers.
One friend gave me his laptop computer an HP compaq 6510b with some monitor issues (later i discovered that the inverter and the lamp were broken) to reach the main lcd connector i had to disassemble the power button panel then also the keyboard. Now i have reassembled it but i can't type anything, the keyboard seems to be dead, after magnifying analysis nothing seems to be broken on the ribbon cable, it is still entirely perfect.

1-Before my disassembling the keyboard was working
2-i have powered once the computer without connecting the keyboard
3-the laptop is totally messed up with both Vista and Windows 7 installed on it
4-I have tried to remove the CMOS battery and wait for 20 minutes, nothing.

It is driving me crazy, i don't want to buy another keyboard, but until it will be absolutely necessary i want to know ALL things i can do to save it.
(sorry for the bad english...)
2 answers Last reply Best Answer
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  1. Best answer
    Hello and welcome to THG.

    You may have reconnected the keyboard wrong. Go back and re-verify you have inserted the correct lines in their respected places.
  2. Best answer selected by luigiparisi.
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