Today my Apple TV switched itself on and displayed nothing but an Apple logo in the middle of the screen. I switched it off by holding down the play button on the remote for about 6 seconds and the light on the front went out but the logo was still on the display!! Switching it back on made no difference except the light came on again. In the end, I unplugged it from the mains and left it a while. When I plugged back in, the Apple logo was still there, so I rushed upstairs to my iMac and was about to post a question like "Is my Apple TV dead?" when I heard some music. I went back to the Apple TV and it was fine, displaying all the usual menus, etc!? The sound I heard must have been the start up routine or something? Anybody have a clue what that was all about?