Macbook Pro to VIZIO LCD TV via HDMI Grainy Video Quality?

Question

So when I bought my MacBook Pro back in July 2010, I purchased an assortment of accessories to go with it including a special third-party Mini DisplayPort to HDMI Adapter device off of eBay. The HDMI Adapter device works mostly the way I expected it to. That is, the video and audio signal coming out of the MacBook is channeled into the LCD TV display properly so that I can see the computer video display on the LCD TV and sound is also coming out of the TV too.
Just one minor annoyance: video quality. Actually, the picture is perfectly fine and beautiful, except for some reason I get weird video artifacts that are basically tiny specs that quickly fly across the screen very rapidly and they are all over the video display. Almost like the video signal is partially grainy or fuzzy or something.
I've tried to Google to see if anyone has reported any similar problems, but no luck. I wish I knew exactly what device in this process is the culprit of this behavior; i.e. either the MacBook, the HDMI Adapter, the HDMI Cable, or the LCD TV (Vizio SV470XVT 47" 1080p 120Hz LCD HDTV).
If anyone can help to possibly instruct me how to fix this problem or how to further diagnose the problem, I would greatly appreciate it.

Answer 1

For a 2010+ MBP you can connect with a Displayport to HDMI, which will include Audio.
With older MBP you will need a displayport to HDMI, if you want audio to the actually TV, then you will need to get a cable with either digital out from MBP to the HDMI, or USB audio mixed into the HDMI
eg
http://eshop.macsales.com/item/NewerTech/CBLMDPHDMID/