Jensen TV blue screen problem

Hi group. I have searched for threads and came up empty on this set.
Same with my repair database. This is a model #TS2050J. Televsion was
working fine. Unplugged it, moved to another room, plugged back in and
now only get a blue screen at power up with a display "C24". I don't
know what this means. Left set unplugged for 24 hours and tried again,
with same results. Is this a micro problem or something I can reset.
Buttons on the front panel don't respond. Also don't have remote, and
can't find code for my all in one. Anyone here have a guess as to what
I should check? Thanks as always.
.

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