Try reseating the keyboaqrd cable to the logic board, it may only be partly plugged in or have something in the port. After that, here is Apple anser: http://support.apple.com/kb/TS1449
+
Try reseating the keyboard cable to the logic board, it may only be partly plugged in or have something in the port. After that, here is Apple anser: http://support.apple.com/kb/TS1449
Try reseating the keyboaqrd cable to the logic board, it may only be partly plugged in or have something in the port. After that, here is Apple anser: http://support.apple.com/kb/TS1449