Unplug the audio adapter, leaving just HDMI plugged in. Does it still reboot?
Again, without detail we can not help you. Stop. Think. Leave more than a single vague line in response. We are trying to help you, but will rapidly give up if on you can't even be bothered to tell us what is going on, what you have tried, and what you are trying to accomplish.
Have you fixed the part of the problem where yet another 32" LCD teleports in to your room every time you turn on the 360?