TV stuck on screen

Jun 12, 2018
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I have a Panasonic 50" Vierra Link Plasma TV, model TC-50G10. I have not used it for about 3 years. I just hooked it up and the audio is working but the video is stuck on the hd/sd selection screen. The remote will not let me hit okay or use the side arrows. I can do everything else with the remote like menu items. I reset to factory conditions, but still nothing. Any thoughts or suggestions?