SamyGO

Hey! So, I woke up today and powered on the TV as I normally would, but a message saying "Check that the One Connect is connected to the TV" appeared. From that point, I couldn't do anything. I powered off the TV, powered it back on and same thing. Contacted Samsung Support and suggest to restart the One Connect box, but I don't even have one (nor have I ever). The TV model is UN49K6500AHXPA.

What can I do? Thanks.

Are you sure you didn't try to change model to greater in service menu?
Possibly some clue there:
https://forum.samygo.tv/viewtopic.php?f=98&t=12022

Did not. Actually, opened the Service Menu and didn't even have the option to see the Model. Thanks for the info! Will check that thread.