Why is there green pixels via DVI but not VGA

MacBook Pro
15-inch, Mid 2009
2.66 GHz Intel Core 2 Duo
8GB 1076 MHz DDR3
NVIDIA GeForce 9600M GT 256 MB
OSX Lion 10.7.5
Exernal Monitor: Samsung SyncMaster PX2370 (new)
When I use my Mini Displayport to VGA adapter with a VGA to DVI cable my external monitor displays a normal picture, no problems. When I use my Mini Displayport to DVI adapter with a DVI to DVI cable the external monitor displays a high res picture but is covered with green flickering pixels and sometimes white horizontal flickering. I have tried every resolution in the apple prefs, tried changing external monitor settings and I have also tried various adjustments with SwitchResX. I'm still getting the green pixels, etc and im out of ideas.... has anyone had/solved this problem?

signal static in either the cable, cable connectors, or in signal thru the DVI adapt./ cable.
"Mini Displayport to DVI adapter with a DVI to DVI cable"
excessive connector static points.
Elminating variables as per your above, your "DVI adapter with a DVI to DVI cable" is the source of the static.
Use another and eliminate the variable or dont use same.

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Why is there green pixels via DVI but not VGA

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