Gray/black and white screen

can any one help me to fix this problem:
My monitor is displaying a black.white/gray screen, and I'm not really able to read the buttons or other things on the screen to an extent, and I don't really know the cause or the solution.

The monitor adapter can only hook up the five important signals one way, or your screen would have color substitutions, or the picture would roll or tear. The five signals are:
Red (intensity)
Green (intensity)
Blue (intensity)
Horizontal Sync (start/end row of dots)
Vertical Sync (start/end screen)
The rest of the signals manipulated by the adapters send a code that may restrict the resolutions available, but not the colors and not black & white vs color.
I have seen this problem in Blue & White G3s I updated to 10.3 from 9.2. I had purchased off-brand ATI PCI cards for second displays on these Macs, but not ones as modern as those that shipped in the Blue & White G3. They worked fine in OS 9. But then I did the update to OS X 10.3.
Those black & white screens sure are ugly. And unless you have seen the Monitors Preference pane so many times you can see it in your sleep, it is very difficult to change the settings. When I replaced the display cards with genuine cards pulled from Blue & White G3s, the problem cleared immediately.

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