If you have good color perception (I don't), then try this. Make an image the size of your monitor. In the mage do a gradient running from the upper left corner to the lower right corner. The starting color should be white, the ending color should be black.
View the image and see if there is anything other than a shade of gray across the screen. All monitors default to a color temperature (9000K to 9500K) which should show a blue cast in areas of the image.
If you can adjust the color temperature of your monitor, it should be set to around 6500K.