All of a sudden, My display is jacked up... Please HELP

I have a power mac g-4, with Nvidia Geforce2 mx. This machine has worked fine for years, and now all of a sudden, my dark screen colors are very dark, and the bright screen colors very bright.
I switched the monitor with another machine at work, and the monitor works fine on the other machine, but the other monitor still has the same symptoms on said mac.
I tried reinstalling the driver from the mac support page, but to no avail.
Does anyone have any idea how I can fix this without getting a new video card???

Open the Universal Access pane of System Preferences, click on the Seeing tab, drag the Contrast slider all the way to the left, set the monitor to Black on White, and turn off the other checkboxes except for those at the bottom of the window.
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