New Mac Mini intermittent video problems

I just set up a Mac Mini 2009 version and I'm using 2 LCD monitors. One is a Planar PX2611W and the other is A Samsung Syncmaster 191t. Most of the time they work fine but I'm getting intermittent problems:
1. The main monitor (plugged into the mini DVI port) occasionally just displays multicolor static noise.
It resolves itself after a couple of minutes.
2. The secondary monitor (mini display port) was working but then just stopped displaying. I checked the connections and they were good. I was finally able to get it working again by unplugging and replugging in the connection to the mini display port.
Could this be a faulty video card or a faulty display port?

Here is a "must-see" thread from MacBook section:
http://discussions.apple.com/thread.jspa?messageID=8955103&#8955103
I spent more than hour to read and here is the only take-away:
SwitchResX - http://www.madrau.com/html/SRX/DL.shtml
I tried to add a custom resolution - VESA 1680 x 1050 H: 66.874KHz V: 59.884Hz 119MHz pixel clock, according to the 225MS specification from Samsung. You may check this from the bundled CD from your 226BW. Though, this Samsung suggested resolution made the problem even worse! The screen flash with "multicolor static noise" more frequent!
So I tried to change the V frequency to exactly 59Hz (in CVT-RB simplified mode). The problem...well...I can't say it has gone as I can't spend an hour to look at the screen to check, but I would say, better! It's worth to give it a try!

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