Displays stuck at 256 colors

My elderly parents' iBook is (as far as I can tell---they are 4000 miles away in England) stuck displaying in 256 colo(u)rs. They can set the Displays panel to millions (or thousands) of colors in the popup menu, but it makes no difference to the display. I've got them to restart etc, and now I'm contemplating deleting the "com.apple.preference.displays..." in their user Library.
My question: does seem a reasonable next step?
If not, any other suggestions?
TIA

I had a very similar problem and honestly just stumbled on this solution.
Have your parents hold down the Control, Option, & Apple keys at the same time and press the < key. I have no clue why but on my iBook pressing that increases the resolution and pressing the > decreases it. I have no clue how my resolution got decreased (I personally blame one of my roomates). But I would try this quick fix and see if it helps. let me know if it works for you too! good luck
ALSO:
They can also try to use the ColorSync Utility in the Utilities folder.
There is an excellent Profile first aid option that could also help you out.

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