I have an old (late 2008) Mac OX S and I want to hook it to my HDTV, but I get no signal??

I have an old (late 2008) Mac OX S and I want to hook it to my HDTV, but I get no signal??
Please help!!

I know I had an issue trying to connect a VGA cable to my HDTV, if I did not already have the TV input switched to the VGA input BEFORE I plugged it into my Mac.  Because the TV had not been taking to the port, it was not sending the right signals to the Mac.
When I would later switch the TV input to the VGA after the Mac was connected, I got messed up video.
I'm just speculating this might be related.
But playing 20 questions (some of which have already been asked by X423423X):
What Mac
What TV
What kind of TV input (HDMI, VGA, DVI, other?)
What kind of adaptor are you using on your Mac
Did you try with the TV input already switched to the correct input source before attaching to your Mac?

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