I have a samsung HDTV and My apple tv always worked ont it. After i gave it to a friend for a couple of days after i got it back i plugged it to my samsung and at first i got a green screen with the apple logo inside it and it keeps flashing, then i kept plugging and unplugging the hdmi and now its almost dead, it switches between no signal and mode not supported. I trie to reset it with the remote but it didnt help. PS: there's a red light coming from the optical audio port on the back.
Please help, thank you.
Try this: On the AppleTV, Disconnect power... connect a micro USB Cable to the appropriate port on the AppleTV... connect the other end to the computer where you have iTunes... plug power back into the AppleTV... when it shows as a device in iTunes, restore it to factory settings and go from there.