Minidisplay port to HDMI connection not working

I have an early 2009 Macbook that I hook up to my HDTV thru HDMI. I'd been using a Monoprice HDMI cable that provides audio as well as video (thru a USB cable). It stopped working so I bought a new one. Now I can't seem to get a display on my HDTV - I think the cable is ok because the red light comes on (which is what the old one stopped doing). Is there some sort of configuration I need to do?
thx

Oops, never mind - I just tried the connection again and it's working fine.

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