I am trying to connect my 21" iMac (about 4 months old and it may be 19" dont remember) to my Samsung HDTV (PN50B450B1D) and it doesnt work. Here are the parts I ordered from amazon to connect the two monitors together: The mini display port: http://www.amazon.com/gp/product/B002HU629E And this is the html cable I ordered: http://www.amazon.com/gp/product/B0002L5R78 The cables plug un perfectly to the tv and imac so I dont know what the problem is. I go to that section or input on the tv (hdmi 1) and a black acreen that says nothing is connected appears. When i go to display settings on the imac nothing is recognized either and it says no external display detected. Oh and my iMac is intel based with radeon gpu.