I think someone tinkered with service mode. However all details about this is something I've yet to see Samsung share.
My bet is the answer is "arrange for service".
My advice is to give it back so it won't cost you the e-disposal fee!
Freebie from Work
Powers on fine, then rotates through Red, Green, Blue, White, Black ..
.... then color fading to black, left to right
.... then color to black bottom
[each time for RGBW]
it is like it is stuck in some screen self test
If I connect a PC to the Screen, it is properly detected.
this was in an employee area, so there is no telling what buttons were pushed
no I do not have the remote