Right now I'm using my PC monitor for my 360. For sound, I used the little adaptor that comes with the VGA cable and plugged it in to my PC microphone jack. If you're running Windows XP, you can set your volume control settings to playback sound that comes in through the microphone jack. Works well for me, but the problem is that your PC must be on to get sound out of the 360.
For the question you just asked, I dunno. Sorry.