Funky display contrast on reboot

Something very odd is going on with my 12" G4 Powerbook. The display seems to have an unusually high contrast setting after reboot. The only way to fix it is to connect the computer to an external monitor - after disconnecting, the screen is fine. It only affects one user on the system, and if I take a screenshot and view it on another computer, everything looks fine. Once it's fixed, I can sleep the computer and on wake it is fine -- it only comes back after a reboot.
Performing color calibration, even with advanced settings, does nothing, and I've tried jumping between different screen resolutions and color display modes (millions, thousands, etc) . It seems pretty obvious that this is software related, but I am out of ideas. Help!

This problem has persisted even after moving to a new computer, so clearly it's some corrupt preference file in the user directory. Can anyone help me figure out which file it might be?

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