Macbook Pro to HDMI LG TV

I have a Macbook Pro OSX 10.8.2 that was manufactured in the 3rd week of January 2010. I am attempting to connect it to LG 1080p TV. I have the mini adapter for the Mac with the HDMI receptacle on it. I plugged in the Mini adapter with an HDMI cable running to the TV. I selected mirroring in the system preferences, it shows connecting and on the Mac it shows the match to the LG TV and will go back and forth between a blank screen and a snowy screen, but no picture ever appears. I'm wondering if the Mac is just too old. Any ideas?