Why won't my 2011 21" iMac recognize my 40" Samsung Series 6 LED Tv as a display?

I recently purchased the 2011 iMac and was tring to connect it to my Samsung 40" Led Tv. The tv says that their is no signal and isn't even recognized when i try and "detect display". I am using a Mini displayPort to Hdmi cable that has worked on my other Sony tv. I have tried it numerous times and can't figure out what the solution is. Can anyone give me any advice? Is there some type of software i need for my Mac to recognize my TV or something.

I have found a solution MilkMuny, I had previously tried my 10’ Thunderbolt to HDMI cable (eBay £7.95 10FT Mini DisplayPort Thunderbolt to HDMI TV Cable Adapter for MacBook Pro iMac) and encountered the same issue as you. I then read somewhere on the net that it was a handshake issue between the iMac and the Samsung TV, on another thread I read that a HDMI switch may resolve this issue. So I purchased one of the cheapest powered HDMI switches I could find on Amazon (£10.99 Kinivo 301BN Premium 3 port High speed HDMI switch with IR wireless remote and AC Power adapter - supports 3D, 1080p) because of Amazon’s amazing returns policy I wanted to return it if it didn’t solve my problem. I powered down everything and plugged the thunderbolt cable into the first HDMI port on the switch and a cheep £4 HDMI to HDMI cable from the switch to my HDMI 1 port on the back of my Samung TV. I powered up the switch, then the TV a few seconds later, finally the iMac. It instantly worked! I had to adjust some of the settings in the iMAC display properties so the picture on the TV was mirrored rather than extended and I also had to adjust the scale slider so ensure the whole of the iMac screen displayed on the TV and didn’t loose the menu bar at the top. Now my kids can play Moshi Monsters on the 37” TV. Should I have had to buy a HDMI switch and an extra HDMI cable, should I have to have an extra device plugged into the power socket using up extra electricity, absolutely not. Do I care, well for the extra £15 or so I’m not going to worry. When Apple/Samsung get their acts together and let me dispense with the switch, I’m more than happy with the result.

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