My connection via hdmi to my TV is no longer working. Even if I use a thunderbolt to hdmi converter

Hi, the day before yesterday I turned on my tv which was connected via HDMI out on the mac mini to HDMI in on my TV. Everything was working fine, however I have been trying to set up dual monitoring on another monitor using an HDMI to VGA adapter to my second monitor but nothing was working. I was about to watch a film from the mac to the TV wen I thought it might be the resolution on the hdmi out why it wasn't working on the monitor but was on the TV so I changed the settings and the hdmi to the TV cut out. My main monitor is connected by thunderbolt to VGA adapter and works fine. I can change all the settings for screen resolution on the main monitor and have tried every setting on it then unplugging and plugging in the hdmi cable from the mac to the TV. I get the blue flash on the screen so I know it is being detected but here is where it gets weird.
I figured I would try the thunderbolt to HDMI converter I originally bought for my iMac and again the blue screen flashes up but there is no blue flash or any sort of detection on the TV.
The whole time there is nothing showing up on the screen, even when I unplug my main display from thunderbolt to VGA (the main monitor) and connect the thunderbolt to hdmi adapter and plug in the hdmi to the TV.
I know it's not the hdmi cable as I have tested it on my youview box to my tv and it worked fine.
I also know its not the tv as iv connected my friends windows laptop to the TV using the same cable so it must be the settings on the mac.
I have tried doing a time machine restore to the day I bought it and have had no problems so far until I changed the settings. Why oh why did I mess about with it!!
If anyone can help please let me know ASAP.
It doesn't show up the HDMI output in audio anymore either, however like I say it flashes blue wen I connect the hdmi but seems to have no idea that the HDMI is connected in the display settings! It's so frustrating. I'm going to call the mac support today but if anyone on here hash as any similar problems n fixed them please let me know.
Btw I'm running Mac OS X 10.8.4. I know I can connect via a long VGA cable but that's not really the point. I, at least would like to get my mirrored desktop on my tv back from HDMI!

Ok so I happened to figure it out while on the phone to apple support. Even though the guy was very nice, I think I knew more than him! He was explaining very basic resolution principles I played about. I had the second option in displays resolution. All I did was unplug the HDMI cable, click on 'best for display' then plugged the HDMI in and my resolution on the normal monitor changed to the normal blue, then went black momentarily and then changed to a strange resolution but another window appeared that said SONY BRAVIA HDMI at the top! Hey presto! Don't know why it didn't do it yesterday - I probably left the HDMI cable in or something! Oh well. Problem solved!

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