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There is not so much that could be done to repair a keyboard. Disassemble the laptop, check the ribbon cable connecting the keyboard to the motherboard. If the ribbon cable is loose, tighten it. If it is tight, replace the keyboard with a new one
i took apart a dell and was having the same problem. on mine it turned out to be double sided tape and it pulled right apart. but you should check, check and recheck for screws before you just yank it apart
change the ram memory ...this issues appear when the ram memory is not functional like it should..if you have a way to borrow some just to try ..you will make an ideea If you have more than one boards in the laptop..remove one by one ..and try to boot with the other/s until you locate the one with problem..
check the power settings and make sure that the battery and power cable settings are on when plugged in. Also sometimes a battery needs to be installed to do this. If the power adapter is working then all should be fine.