Red Pixels / Flashing Lines on 2407 FPW

I purchased a 2407 FPW Rev. A03 about 4 months back and was using a 6800 GS Card With DVI connection. everyting was working well unless i bought a Leadtek 8800 GTS Video Card. These are my findings : 1. I get occasional Red Pixels (1 pixel wide) and some Red/Green lines flashing on the screen depending on color. 2. No problem at resolution 1280 x 1024 or lower. only problem comes at higher resolutions. 3. No problem with VGA Input ( I use a VGA Adapter on DVI Port. But problem is there with DVI - DVI Connection on both DVI ports. 4. No problem at Desktop which i am running at 1920 x 1200 @ 60 32 bit. 5. Problem mainly with Games / Movies 6. I think either it is a DVI Cable Quality problem / or Sync Error with the Graphics Card. I have already got two sllepless nights over the issue. Kindly help me cause i am a complete noob with Comp. Hardware.