I just got a mdp to hdmi adapter and have been trying to use it to hook my new macbook to my tv. I hooked the cables all in properly and plugged the hdmi cable to my tv and nothing shows up on the tv. the mac screen flashes blue or w/e like it detected something but it wont detect the tv as a display. I tried different cables and different inputs. So I went to my brothers tv and hooked it up and it worked first try. I'm not sure what the deal is because my tv is not old. Its a sony kdl-v4100 to be exact. Only about 6 months old or so. I'm a little frustrated though because I'm not sure whats going on. Any help would be greatly appreciated. EDIT: I also remember hooking my brothers white macbook up to my tv through hdmi not too long ago so idk why this wouldn't be working. The whitebook did use a mini dvi to hdmi rather than mini display port to hdmi. It also isn't working when I try to hook it up to my hp monitor with a hdmi to dvi cable. The screen flashes like its connecting to a monitor but just keeps flashing as if I would be disconnecting and reconnecting it fast. Once again, it works fine on my brothers samsung tv that is older than either monitor I am trying to use.