Have you run a calibration (make sure to check the "advanced" box) in the Displays preference pane? That should get rid of most color tints; if it's not working for you, you could try SuperCal instead, which sometimes produces better results than the built-in Apple one.
In general color tints are going to be present in any monitor that isn't calibrated. It can be a particularly severe problem in darker areas of LCD monitors, due to the way the LCD displays dark grays.