Keyboard Issue - Some keys are working and some not.

Exact model Toshiba Satellite A665-S5170 I am wondering what keyboard layout setting should I put it as? US Extended? Some keys are working and some not, then 2 minutes later some are back in operation, then not, 567890..... maybe due to keyboard layout setting, currently on US English, weird. Cable inside looks to be connected fully....It was all working fine yesterday....or just suddenly as if by magic it needs a new keyboard or cable? It sometimes works, sometimes not...