Mac Mini to Toshiba 32C120U (HDMI to HDMI) problem

My Toshiba 32" 32C120U is not getting video signal from my Mac Mini. I bought the Mini for my son and this is his TV. I have hooked up the Mini to my older 22" Toshiba and my 56" Samsung with the same HDMI cable and it works great on both. What the heck is wrong with my son's 32" Toshiba? I have called Toshiba customer support and they won't help with my question without a $35 charge because I'm just out of the year warranty . . some customer support that is !!! I really don't know what they would be able to tell me other than thanks for your $35 and sorry we can't help you. I did update the firmware on the TV and the Mac Mini has been completely updated as well.
I have also tried both HDMI 1 and HDMI 2 ports with his Xbox with success, so both ports work. I have also tried both ports with the Mac Mini and there is "no video signal" on both ports. I noticed that when I hooked up the Mini to the other TVs it automatically selects the best video setting, so there is obviously some communication that happens between the Mini and TV, but that is not happening with my son's TV.
Any suggestions would be greatly appreciated.
Thanks in advance,
John

Toshiba 32" 32C120U
Display Resolution: 1366x768 (720p)
Refresh Rate: 60Hz
Monitor's port layout:
Video Graphics Array (VGA) ( not recommended)
2x High Definition Multimedia Interface (HDMI)
(Supports 1080p/24/60), HDMI-CEC
The Mini's port layout:
Orange : High Definition Multimedia Interface (HDMI) cable connect to HDMI above
Black : Mini DisplayPort/TB to HDMI adaptor to connect to HDMI above
Try the Apple Store's recomended Mini DisplayPort to HDMI Adapter.

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Hope you can help.
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