I've been using the tv as a monitor for a while now but suddenly it stopped recognizing my computer. It just shows the no signal screen. The tv is aware that there's something connected because if try to remove the channel it says that there's something still conceted.
I try factory reset, different ports, updating and nothing worked. I plugged another pc and worked just fine. Tried my pc on another tv and worked as well
Have you tried contacting the TV manufacturer to inquire further? I'd suggest starting there to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.