Imac to TV via HDMI

Guys need some advice,
I'm trying to connect my Imac (latest model with most up to date software) to my LGD tv with no luck?
I've contacted apple support with not much luck, was asked to reset the NVRAM and the SMC, that also didn't work, when i click on the display logo top left of the screen the mirror display is shaded gray like it's not seeing the connections.
I know the cables are fine because i connected my Macbook air to the tv no probs,
I have a call booked to the help desk tomorrow but any ideas?
Thanks in advance

Thanks!!! I selected sound control panel scrolled down and selected Panasonic TV. This also changed the display to mirror what was on the monitor rather than the tv being an extension of the monitor. Thanks to you I now dont look quite so stupid in front of my girlfriend. I had invited her round to watch a film and was showing her my new av gear. To which her reply had been 'great picture but it would help if there was some sound coming out of the 19 speakers. Thanks again!!

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i

I'm having a very similar problem.
I've got a 2010 iMac that I've got hooked up to my Pioneer Elite via HDMI cable using the Moshi adapter.
It's been working great for months, but today the audio began dropping out -- a fraction of a second, every six seconds or so.
I installed the latest Snow Leopard update today. Does anyone think there might be a connection?
thx!

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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.
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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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I want to connect my IMAC to TV with HDMI cable. I did it before going to Dispaly and Arrangments and then mirror. Now when I go to display I dont have to option of arrangements. Olny {Display and Color} pops up. Any ideas what happend to arrengements?

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I actually discovered this answer about 5 minutes after I posted the question. Thanks a lot for your help!! Funny thing is that it had worked all along with something plugged in the headphone jack but suddenly stopped working. Again, thanks!

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Imac to TV via HDMI

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