Currently Being ModeratedDec 28, 2012 8:53 AM (in response to crisdun)
The most common culprit in these cases is the HDMI cable. If you can find another one to try that would be the first step. I suffered this same fate with a cheap cable bought at Walmart, and it would not work most of the time. Figures it was the cable when my Xbox did ther same thing with it. I changed it to a better gold tipped cable, and all went well.
You should also try resetting the iPads. Hold down the Home and power buttons until the Apple Logo appears. Ignore any sliders that appear.
When the iPad turns back on, and is at the main screen, plug in the adapter with the cable attached to it and plugged into the TV. Both iPads should mirror their screens onto the TV after a few moments.
Currently Being ModeratedDec 28, 2012 9:24 AM (in response to Phil0124)
The reset on the iPad 2 did not change anything. The iPad 2 does know when it's connected to the tv (when a movie is played, it says 'playing on the tv') and it knows when it's not connected. The iPad 3 continues to say 'accessory not supported' and does not display anything. I may try a new hdmi cable.
Currently Being ModeratedDec 28, 2012 9:26 AM (in response to crisdun)
Make sure the TV is set to the correct input for where the cable is plugged in.
Currently Being ModeratedJan 5, 2013 9:15 AM (in response to Phil0124)
I was able to borrow a known working hdmi cable from a friend, and I have the same problem. I now believe it may be some issue with the tv. Is that possible? The iPad thinks the movie (or whatever) is playing on the tv, and the tv knows there is something in the input, but doesn't display video or have sound. So frustrating. Not sure how to debug this anymore. I guess the only other thing would be to try and connect my setup to someone elses tv who is able to play computer or ipad based movies, etc.
Currently Being ModeratedFeb 8, 2013 3:31 PM (in response to crisdun)
I purchased the Apple Digital AV adaptor to watch video mirroring on my tv. I have two identical ipad 3's.
One works and one says equipment not supported. This eliminates the hdmi cable or the adaptor or the tv.