I am guessing you want to know how to fix this problem?
I think the whole thing is fried you might have to call insignia and have them send people over
connect the HMDI from your GPU to your receiver, from that HDMI to the TV. you are going to need to fiddle around with some settings. but it should work
industry standard of 4K is 4096 x 2160. But your video card might have a hard time doing it.
It depends on the computer game. go through the menus and look for 4096x2160 or search online forums. But 4K is "new" so there would not be a lot out there.
sorry I have no clue but I do know that...