Hi, I have a HF20 and have a Sennheiser G2 and can't get any audio. I reset the setting on the mic and camera and all I get is a loud humming noise. The cable connecting to the camera seems to fine too.

Never mind. I changed the headphone setting in the menu. Fixed it.

I've had the same experience with my HV20. It took a little fiddling with the settings to find out the same thing, but I was quite concerned for awhile.