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Hi there and welcome to Just Answer, my name is Richard and I look forward to helping you.
I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
Right click on the screen of the computer please, then right click on Display Settings.
Select the TV as the screen there and then change the resolution down the screen to get a picture that displays best for you.
Let me know how you go please