So, I finally got the right cables to connect my 20inch imac to my HDTV through HDMI. However, the TV image is ridiculously dark. For instance, watching Dr. Horrible, in his lab you can see objects in the background on his desk and shelves. Gone, on the TV. Messing with the brightness controls and options on the iMac or the TV doesn't help. Does anyone else have this problem and have a solution? Thanks!