I was watching a dvd and wanted to switch back to cable. Pressed video source and TV but don't get a picture. Why?
Your TV might have multiple inputs, and you still aren't on the correct one?
Is your cable terminal on? Or is it currently "off" in stand-by mode? If it is in standby, you will just get a black screen.
Hopefully you've figured out what was going on dashwell. If you're still having any problems though, let us know and we'll help.
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