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This isnt a user error, there isnt a valet mode or function to switch of the screen if its dead all but the sound from the radio it suggests a loose DIN connection at the rear.
It is rather involved removing the head unit without damaging the dashboard, but before doing so I would be inclined to disconnect the battery terminals for 30 mins, turn the key in the ignition without the battery connected, turn the key off, then reconnect the battery and test the radio, as it may have just got itself confused, this has about a 20% chance of working but is something you can do with ease.
Let me know how you get on.
Great, let me know how you get on once you turn the key back off and reconnect the battery.
Do you require any further assistance?