Sorry I can't help directly
It could be software
hiccup and maybe this can be reset by key entry but again I don't know the sequence (if any).
If you are feeling brave, you could try some "random" button pushing like holding the up and down channel selector buttons down (together) for 5+ seconds or turning it on with these buttons depressed or similar ideas.
These units are getting a bit old now and maybe it is telling you to replace it
but I would wait a bit longer for CF help or for GME to get their site back up.