Laptop Keyboard not working

Jun 8, 2018
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Hey guys, i need an advice on what to do with a laptop i bought on Ebay.

Since the first time, the keyboard didn't work at all, however, the wifi key led its working (red when off, white when on) and also when i plug a USB keyboard, the caps look led also works. But i can´t get it to work on the laptop, i've reinstalled Windows 8, 10, even Linux and still the same, keyboard doesn't work on BIOS neither.

Also i bought a new keyboard, and does the same thing. What else do i have to check? I cleaned the connections on the motherboard and make sure it's well plugged on its place.

Thanks for the help.