power driver seat not working,help!!!

Quick question,

I have a friend who just bought a 95' mustang w/ a power driver seat.
When you try to engage the seat you can hear the motor running and feel the seat trying to move but it doesn't. Anyway, I told him I would look at it for him to see if it could be fixed. Any suggestions on what might be the problem?

I also thought since he doesn't have alot of money to get it fixed, that we could just swap the two front seats, that way he can at least adjust the driver seat properly so he can drive. Is that doable?

Any ideas yall have is greatly appreciated. Thanks.

Look, I'm not lookin' to criticize the kid about why he bought the car like that or if he did that after he bought it!! I'm just tryin' to help him out a bit.
So if you don't have any helpful info. to post, stay off my thread!!!