HT201335 When i try to mirror it shows the blue line at the top then turns back to black

When itry to mirror it wouldn't show on tv but it would show the blue line at the top the. It would go back to black

First thing to try is to reset your device. Press and hold the Home and Sleep buttons simultaneously ignoring the red slider should one appear until the Apple logo appears. Let go of the buttons and let the device restart. See if that fixes your problem.
If that doesn't fix the problem Make an appointment at an Apple Store to have your device examined by a technician. Or contact Apple Support.

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