Mac Mini HDMI - HDMI TV: Unsupported Signal

I have had my Mac Mini connected to a Toshiba TV HDMI-HDMI for many years without a problem.
I recently purchased a Sony Bravia TV and connected my Mac Mini to this using the same HDMI cable
Initially I had no problems although the resolution was not as clear as I would have liked
I tried to change the resolution using the Mac Mini display properties settings
Shortly afterwards the screen went blank and the Sony Bravia displayed an error message saying "Unsupported Signal - Please Check Device Output"
Oddly, when I restart the computer the screen appears to display fine but within a few seconds the screen goes black again with the same error message displayed
I have been on the forums and have tried all sorts including restarting the mac in safe mode but to no effect (it works again briefly only to go black again)
I have also connected it back to my old tv to change the resolution and refresh rates - I have tried all of these one by one and reconnected to my new tv only to experience the same problem.
Please help!

New here. I've just purchased 2 of the new mac minis, and 2 new LG 32" 1080p hdtvs (32LD450) for displays. They are for my new computer room for Christmas for my wife and I. But, with Best Buy's 14 day exchange policy, I hooked both of them up to see if the resolution was good, and too make sure both minis worked right. I went with the hdmi to hdmi setup, and when I turned on the minis and tvs, the page size was smaller than the screen size. I went into the preferences/display settings and 1080p was recognized. I kept this setting, and 'under scan' setting was available. I messed with that a little, but could not get it perfect. Then, I pointed my cursor over the bottom right corner drag and pull tab, and adjusted the page to full screen. The page size and resolution is perfect now. One thing, though... It seemed that whenever I switched to a different app that several times I had to adjust by the bottom right corner page pull tab to get those page sizes perfect also. But after I adjusted it one time, it was set every time when I went to that app again. I'm pretty sure that everyone who has had the page size/fitting screen issue has tried the page pull tab, but this seemed to work for me.

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Message was edited by: Numenorean

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Mac Mini HDMI - HDMI TV: Unsupported Signal

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