Driver's side low beam not working

I have a 2005 Yukon Denali XL. The low beam headlight on the driver's side will not work. I replaced the bulb. Still won't come on. We had just driven the truck up the Dalton highway (The rough road seen on Ice Road Truckers). I was wondering if something shook loose? I can't figure it out. Any ideas?? The passenger side low beam works fine, and all the other lights work fine. Any suggestions would be much appreciated.

Check out the socket with a digital multimeter (voltmeter) or DC test light, see if the socket is getting power.

Also could be separate fuses for each side.