If you've never used an HD model before (I know very few people in the MS industry have them), the cam connection is different. It's not a mini RCA plug like the others, it's a blade type plug. It's difficult to plug it in without getting it all the way plugged in. Mine won't turn on without a camera plugged in and if the camera isn't plugged in correctly it attempts to come on and locks up. I seriously doubt this is the issue. Besides, with the standard cam if you're not plugged all the way in you generally get video but no audio as opposed to audio but no video.
There are reasons that a body stays in motion
At the moment only demons come to mind