Cannot connect samsung hdtv to imac

Hi Accidently posted this on intel forum but someone suggested this is correct place.
Have 2.7ghz I5 21 inch Mac with OSX with 10.7.4 version. Have purchased new Samsung 7500 HDTV and cannot connect the two. Have purchased Thunderbolt to HDMI converter cable all in one. All the TV says is no signal.
Have tried
1. All three HDMI ports on the TV
2. Each combination of turning each device on including another thread suggesting turn TV on first with cable connected then turn Mac on
3. Forcing computer in displays to detect TV but it does not
Any suggestions greatfullly recieved, many thnaks

An Update
After trying to solve this for a few days took the Mac into the TV shop. Mac worked with Panasonic, LG and Sony and even worked with Samsung Series 5 & 6 but not with Samsung series 7 or 8.
Hence have returned Samsung and now have a Panasonic.
Not sure if other Apple products are affected but a Mac and Samsung Series 7 & 8 are not compatible, surely this will be a big issue??

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