Front Passenger Window Won't go up

My passenger front window has been having problems going up for a while
now (slowly and takes a few times using the switch). sometimes pushing it
down them up worked. but it no longer goes up no matter what trick i use.
the motor doesn't sound like its doing anything anymore either. all my other
windows work. could it be the motor or wiring? its still on the track and it
didn't just fall right down.