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Monitor is saying "input signal not supported".What have I done wrong?

Originally I have just used my smaller monitor for my computer. But this recent Black Friday I got this new 43" 4K UHD smart tv. And I wanted to use it as a smart tv (of course) and also as another display for my computer, so I'd have a dual display.

But somehow wound up having my original screen saying "Input signal not supported" and my flatscreen just giving me no signal.

What have I done wrong? And how do I get it back to normal?

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right click

down arrow 10 times

enter

TAB 2 times

enter

down arrow 5 times

enter

TAB 8 times

enter

TAB once

enter

if this doesnt work, try connecting your pc to the tv and use the tv as a monitor and change the resolution to 1280x720 and connect the pc back to your monitor then maybe it'll work, if it doesnt change the resolution to less than 1280x720, hope it helped

My pc also has this problem but i havent been able to connect it to my TV

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Logan Hupp 님은 대단히 고마워 할 것입니다.
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