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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.

Notes:
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.
PLEASE HELP ME!!!!
(sorry for the bad english...)
2 answers Last reply Best Answer
More about cannot access bios keyboard work
  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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