I have a 2011 i5 iMac and I am trying to connect it to my Samsung PS50C680 Plasma TV. I am using a MDP to HDMI cable and using HDMI 1 which is the correct input according to the manual. No matter which I turn on first the iMac still cannot connect.

I have a 2011 i5 iMac and I am struggling to connect it to my Samsung PS50C680 Plasma TV. I am using a MDP to HDMI cable and using HDMI1 on the TV as shown in the manual. No matter which I turn on first etc the iMac cannot find the display and the TV shows no signal. Has anyone else had a similar problem? Any help would be appreciated.

Hello, anabelleho. 
Thank you for visiting Apple Support Communities.
Here is a troubleshooting article that I would recommend going through when experiencing this issue.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Cheers,
Jason H.

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