AVS Addicted Member
Join Date: May 2003
Location: Orange County, CA
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First make sure that you are trying to send a resolution over the DVI/HDMI interface that your TV's user manual says it will accept over HDMI/DVI. Most HDTV's accept only 480i,480p, 720p, 1080i, 1080p or as subset of this list over DVI/HDMI.
Exactly what adapters/cables are you using from the Mac to the TV.
No there is not an adapater between an analog VGA connector/signal and a digital HDMI connector/signal. You would need a VGA to HDMI transcoder which is not inexpensive.