Cubase doesn't see my keyboard

Hello…I am new here. Trying to hook up my Yamaha PSR-170 to use with Cubase LE 6 with no luck whatsoever. When I first plugged the keyboard in, Windows recognized it and installed drivers, but I can’t get Cubase to recognize it at all? Any ideas or thoughts would be appreciated.

Is it plugged in and turned on when you start Cubase?