The only thing I can think of is to try reinstalling the drivers. Try using the manufacture's latest release instead of the ones directly available
from nViDia.
Also do you have these problems with different resolutions, 1024x768, 800x600...?
What about different graphic APIs, DirectX (most Windows games) or OpenGL (every game using graphic engines of Quake 2/3 like Soldier of Fortunes,
Jedi Academy....)
I checked the cable, OK, update the driver for graphics card, and installed DirectX 9.0.
All of the pictures I have on my computer are ok. Any of the pics I download from the internet are not. The pics or graphics on the internet are the
same as before.
I believe it has something to do with I.E., but I have been unable to find a setting that would fix this.
There was a program called Internet Optimizer running (don't know where it came from). Anyway, I uninstalled it and rebooted. Now all of my graphics
are coming in crystal clear.