Bad power window switch, regulator or motor?

When I try to roll down my drivers side window, nothing happens but I hear a clicking sound. It did that the other day but then started working again.

I had the same thing happen about a year ago and had the switch itself replaced so I don't know if its the switch again or if its the regulator\motor.

Can I take the other switch off the drivers side panel that's used for the passenger side and put it where the drivers side goes for a test? I'm assuming its the same switch. Do I need to disconnect the battery for this too?

I don't know if its related but when I got in my car this morning now I have a buzzing sound that comes through my speakers that goes along with engine RPM. Once I get up to speed it seems to go away though.

For some reason it was working this morning so maybe closing the door shook it loose. The stereo stopped buzzing too but then started again later on. I'm assuming its the regulator.