How do I get a Mini DisplayPort adapter and HDMI connection working for my Older MacBook Pro?

I bought a Belkin Mini DisplayPort adapter and attempted to hook it up on two different tvs using two different HDMI cords. I've always received a "no signal" message. I haven't even been able to get my desktop to appear. My display settings doesn't include a mirroring option and I only have the option to use my computer as a sound output. I've called apple support and I went to geek squad. Is it just impossible for older MacBooks?? I have Snow Leopard 10.6.8 and all of the forums I've read say that video should work at least. I switched out my adapter for a rocket fish one and still no luck. The geek squad employee couldn't get it to work on either adapters. Please Help!

I upgraded my OS to Mountain Lion and now it works perfectly. However, I'm getting random green and black splotches on my screen when I'm not using it with the TV.

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