The Control-Option-Command-8 key combination didn't work what do I do?

Mac OS X displays inverted image colors (white on black, reverse type)

Your computer may display a reverse image if certain keys are pressed at the same time. Depending on your configuration, it may be black and white or inverted color, as shown below.

Press the Control-Option-Command-8 key combination. This is actually a feature of Universal Access that you can toggle.