[SOLVED]820-2879 - No Keyboard or mouse, fan spins up like there is no trackpad.

[gcain]

Pull out of an old MacBook that was laying around the shop, so I don't know the history.

Board looks really clean.

As in the subject; doesn't see the keyboard or trackpad at all. Jacks all look good.

Not really sure where to start, haven't had a board that can't see the keyboard & trackpad before.

 

[gcain]

Fans not spinning up any more, so looks like I have the TP working ok. (Haven't booted into an OS yet).

Still no keyboard.

Power button on keyboard works though.

 

[gcain]

Oh. So I did a PRM reset and the keyboard is working.

Can anyone point me to any documentation on how the PRM reset works and what it actually does?



Edit: To clarify, I couldn't press Option to get the boot menu. So I tried Command+Option+P+R just as another bunch of keys to test with and it did a reset. So I pressed option on the next boot and got the boot menu.

 

[dukefawks]

It could have had an EFI lock. On these old boards that will reset when you change RAM and PRAM reset it. Also without trackpad the keyboard will act weird sometimes.