MacBook Pro Mini-DVI to HDMI problems - not consistent

I have a MacBook Pro and I'm trying to hook my LG LCD up from the Mini-DVI to HDMI cable.  Sometimes the TV is recognized no problem, but sometimes the TV doesn't receive the signal, any thoughts on how to make sure the TV is always recognized?
I saw a post once about having the macbook boot connected to the TV to recognize it, and it worked, but I think I'm missing something again because I can't seem to do it again!  I'm looking for the post but can't find it!

Just to add, i think the cables are all in working order as when i plug in the adapter to the macbook the screen temporarily goes blue then back to normal desktop. This only happens if the cables are plugged into the back of the TV. However they two still wont recognise each other.

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