External Monitor RGB Noise Flickering with MacBook Pro

Hi folks,
I recently bought a MacBook Pro and plugged into it an HDMI converter to DVI, so I can plug into the MBP the LCD Apple Cinema Display of 22" and have 2 monitors working or, just one while using the hardware of the MBP.
The MBP has 8 GB of RAM of 1333 MHz and an additional ATI video card of 1 GB.
So, when working with the Apple Cinema Display plugged into the MBP, some kind of fast graphic anomaly occurs, which looks like an RGB noise. And that happens in a blink, each about 5 to 10 minutes and only in the Apple Cinema Display.
I'm wondering why happens this, because I need the big screen to work. Also, the MBP costs me a lot of money (US $4000 because I live in Argentina) and we don't have here the easiness to go and buy another or change the product because of a "just in case" thing due many other implications from the actual government.
So please, let me know why this happens and if it's dangerous. I don't wish my hardware get broke because I use it to work an there are no replacements here.
Thanks,
Ø3

I ended up buying the HDMI cable and adapter for the mac and the screen quality is GREAT! It auto sets itself to 1080p. Don't use VGA. Get the HDMI cable and adapter.
Again, the horizontal lines are from me taking a picture of my monitor from my iphone.
I hope this solves your problem.

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