Hi, I just bought a Sony Bravia HDTV with the intention of using it as a 2nd monitor for my iMac. I used a Rocketfish brand mini-display port to HDMI adapter & connected it to my TV using HDMI port 1. When I selected the HDMI 1 input I got this message on my TV: "No signal. Check the external input or select another input using the INPUT button." I unplugged/replugged the cables & still get the same message. I shut down the iMac, turned off the TV, restarted everything & still get the same message. I went to the Device List on the TV and "enabled" it and rcvd "No HDMI devices were found. Please check the connections." I'm obviously missing something. Can you help me? I'd hate to have to repackage this TV & send it back. Thanks.