Macbook hdmi adaptor

I have a macbook pro 15" from late 2010, i have a belkin hdmi adaptor from the apple store.  the adaptor was working fine for a couple months, but now it is acting up.  the screen on the mac keeps turning blue but my 46' tv keeps saying detecting.
The display from the macbook actually shows up on the tv at times, but goes away when i move my macbook.
I'm thinking maybe something happened to the adaptor or the port on the macbook because i travelled with the macbook while the hdmi adaptor was connected.

so i have a 2007 macbook (black) and saw this thread and heard the same from other people. so i bought the moshi mini displayport to hdmi adapter to try and watch videos (streaming movies and itunes purchases) on my tv. i got the extra cable for sound, as recommended also. However, i cannot even get the picture to show up on my tv. i have my input on the tv to the correct hdmi port and the adapter plugged into what i think is the right firewire port but nothing is showing up on my tv screen.
before i even worry about the sound, i want to make sure the video picture even works, but i keep getting "no signal." any suggestions?

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