For some reason theres a black box about 1/3 the size of the picture in the middle of the screen. It goes away anytime you push any button, but comes back within 3 seconds. I've tried everything i can think of. Please Help.
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What you have described is definitely some form of Electrical Interference. Interference can come from a variety of causes. Is the Cable Inputting the Cable Box close to some High Voltage Electrical Lines? Or Are you located near some Electrical Power Station? Or A Police station, where the Radio Transmitter of the Police Station causing the Interference? As I said, there are a variety of reasons. Also, Try to check if the connector is loose at the rear of the Cable Box, or at the rear of the TV.
You will have to eliminate every possibility reason.
Wish i could help further.