I bought a new iMac and ATV about two months ago. Everything worked fine out of the box. However, I no longer show ATV in my iTunes, music no longer streams downstairs to my stereo and ATVs screen is blank. I've tried using the ATV remote and nothing happens. I tried to unplug the ATV for a few minutes hoping to reboot/restart this piece of junk but nothing seems to be working. Any and all help would be appreciated.