OK here's a strange one....my son has an '84 300D. My wife drove the car today - put the drivers window down (electric windows) and it didn't want to go back up. Trying to diagnose the problem I put the rear window down on the drivers side, and now it won't go up. Passanger side windows work fine. I suppose a hint here is that both windows went down fine but don't want go back up. No sound like a motor trying to move, no clicking, no noise at all, just dead windows, Any ideas?