wipers died

It was -40 this morning and my wipers decided it was too cold to wprk properly. I hit the pump and the wipers budged only about an inch. I repeated this a few times until they were half-way up, then, the stopped all together. When hitting the switch I can hear the buzz of the motor and the click of the switch..would that rule out a simple fuse problem? I'm hoping I didn't burn out the motor : (

Any ideas while I sit waiting for it to warm up ??

looks like a nut came off the drivers side wiper assembly...looks as though it's just a 8mm..doesn't look too hard to get at.