No video output from AppleTV after update.
Basically the AppleTV is starting up OK but not outputting anything on the screen. I have tried different HDMI cables and a different TV (both newish LCD / LED tv's) but nothing is coming out.
My iPad is picking up the AppleTV and allows me to remote play to it but the TV's are picking up no signal at all and nothing is shown on screen.
Apart from pulling the power, is there any way or resetting this thing if I can't see anything on screen?
MacBook Pro, Mac OS X (10.6.5), iPhone OS 4.2.1