Kick the door on the inside. My motor would stall with the window all the way down. If I kicked the door panel at the right spot, it would work. (This was before I did the interior over. Also, a friend had a F*rd that the window was stuck on. The way I got that one up was I hopped in, held the switch, and slammed the door. There was a dead spot in the motor, and that was enough to jar it and make contact. Your bes bet is to pull the door apart, and make sure you are getting voltage. If you are, then replace the motor. Or, you can just rap the motor with a hammer. I found the cost if the motor is worth saving the aggravation of having it not work. After all, you are going to replace it eventually, so why not now? Good Luck.
Brian