Picture flickers on and off after a power cut - seems locked

Just had a power cut in the street and when I turn my apple TV on now the home menus come up on the screen for 2 seconds then disappear for 5, then this repeats.
The remote won't scroll along although it seems to be paired but more concerened about why the flickering is occuring as I can't use the device.
Any help?
ATV2 on 4.4.4

Try restarting the Apple TV by removing ALL the cables for 30 seconds, or resetting it using the reset option under general. You should also try restarting your router.

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