Over bright gamma?

This is a bizzare one, and i'll start from the beginning to make everything clear as to what has happened and going on.
One of the macs at my work place seems to be what looks to me like the gamma or contrast has been turned up too much so that there is no distinction in shades of dark colours, and greys look white so editing photos and designing is being affected when going to print.
It all started back on their old G5 mac when the apple displays were swapped (same type, the ones with the clear plastic and touch sensitive buttons). She's obviously upgraded to the intel mac pro and copied all the settings across which has transfered this problem with it.
I booted up the old mac today, and as the desktop is loading I noticed a massive change in the brightnesses of the wallpaper as it finished loading (went from normal/light to a darker blue).
When I logged into the macs via VNC the bits that are meant to be grey are grey, and everything looks like the other mac pro we have, i.e perfect but still on the screen of the actual mac, those bits are white.
I've tried calibrating the screen, but I cannot seem to get what ever is causing this whiteness/lack of distinction to go away. I've even tried a PRAM/NVRAM reset (on the old mac to see if it would cure it there first before trying on the production mac).
Any ideas if there is something elsewhere that needs resetting or turning down?
Message was edited by: AndrewMurphy

Changing the Color under System Preferences -> Color -> Display Profile has no effect I assume since you tried Calibrate?
Try checking under System Preferences -> Universal Access -> Seeing -> Contrast slider under Display
If that doesn't work then try another monitor, if you haven't already, and see if it persists.
May have to go pull some plists if this doesn't fix it though.

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