I can't get a signal on my TV to Apple TV

I bought Apple TV last week on the Apple store, connected to my main TV and it worked fine. I want now to use in my other room downstairs and when I plug it to the TV using the same HDMI cable it is unable to recognize the Apple TV.

When I turn on the TV and Apple TV it has the symbol of the Apple for 1 second and then disappears and says "unknown device" on my tv screen.

Any help would be appreciated,

Thank you

Mark

This can happen if the HDMI cable is faulty.  Also if the cable is not perfectly in its port at each end which can be a problem.

Tags: Apple TV

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