03 Chevy 3/4 ton power passenger window won't move

Had the same issue on my drivers window on my 2001 Tahoe. Took it into the Chevy dealer and the female service writer said perhaps up to $400 to diagnose and repair. I flinched and she said let me try this....she opened the door and smacked the door just below the armrest and success, the window worked. That was four years ago and it is still good to go.