HT4241 i am trying to connect a hdmi cable to my mac book air i hit source list but not is showing on my tv  can somone help me to fix it

i connect a mini display port to my HDMI cable but all i am seeing to the TV is the screen saver on the main screen i am unable to view videos on my tv  can any one help

It's possible the TV doesn;t support the same rersolution as before.
Does the LED flicker when you press remote keys?
If so try holding menu and up arrow together for 6 seconds to cycle display resolutions.
If possible try a different HDMI cable/HDMI port.
If all fails you may need to do a restore as described here:
Apple TV (2nd and 3rd generation): Restoring your Apple TV - Apple Support

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