Too much contrast

Don't know if this fits here but...
Suddenly, my Powerbook's LCD display has changed and shows so much contrast that I cant see grays and there is too much whites. I cant correct this with the brightness control or the "Calibration: in Displays. Tried restarting several times, but looks same. Is this a hardware or software problem? Any suggestions welcome...

Plot thickens...in an effort to fix the contrast problem, we replaced the 256MB RAM module with a 512MB module. It froze on boot twice, then successfully booted but only showed a 256MB module. We exchanged the memory for new memory, and this time it always froze or kernel paniced during boot.
I returned the original 256MB RAM module, and we are at least back to where we were -- system works, but too much contrast.
I bought PC133 RAM as described on Apple's site. Hm. Time to write off this old iBook?
Kevin

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