My ATV has stopped booting, and I only get the flashing yellow light. I've tried getting to the diagnostics screen through the remote, but no luck. The device flashes immediately on boot, and won't even display an image to the TV. So my question, is there anyway to externally boot the machine via USB? I feel my symptom is a software issue (I can hear the HD spinning down when I unplug it) so I'm trying to get a way to reinstall the software. I would even be willing to put in a new drive - if I had an image to work with. Also, the ATV is out of warranty, and I don't live in an area that has an Apple Store. So I'm stuck. Any advice/help? Thanks.