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Hi , I`m JackPerhaps I can help you with this problem
Is this anew setup or one that stopped working correctly ?
ok then , thought we were talking about tv a surround system
What is happening now , do you get a message like " no signal " ?
Did you try the INPUT or SOURCE button on the tv` remote ?
o.k , on sony tv`s it is called TV/VIDEO , have you tried to press that button a few times ?
o.k and what happens when you press it repeatedly ?
o.k then it looks like the cable box may be out of action , anything else like a dvd or game connected to this tv ?
not much choice as a test here , is it a cable box anyway ?
o.k hen pull out its cable and plug it directly into the tv then set the tv to a lower channel , do you get anything on the screen ?
Hello and Welcome. My name is ***** ***** I'll assist you today. I'm sorry you're having trouble with it.
- Have you tried to reboot cable box?
Unplug cable box power cord from wall outlet for 3 minutes, replug back in and let it reboot that may take several minutes to finish then select HDMI input of TV to see if picture appears?