Why won't my drivers side mirror stop making noise?

My drivers side mirror won't stop making noise, it's a constant noise. The mirror motor just doesn't turn off. Only way I can get it to turn off is by balancing the retract button. I have to get it perfectly so that it doesn't retract the mirrors. Passengers side is fine, retracts and folds out. Drivers side won't do either, just stuck, making that constant irritating noise.

Please help.