Display is showing everything as a negative image

I have a Power Mac G5 Tower that I bought in 2005. This weekend the display started acting strange. It is now displaying the typical apple blue background screen as a brown/orange color. When i bring up a standard .jpg it looks like an old fashioned picture negative. When i bring up any website that has a photo, it also displays the image as a negative. This is also effecting all my folders and even the backgrounds of menus. (If it was a white background with black letters, it is now a black background with orange letters). Has anyone seen anything like this? I tried plugging in another monitor, but the same display issues are there, leaving me to think it is not the monitor, but the computer that is the issue. HELP?

Hi
It sounds as if you've accidentally hit the keyboard shortcut which negates the image for the visually impaired:
http://docs.info.apple.com/article.html?artnum=107329
It can be toggled back by pressing Control(Ctrl)-Option(alt)-Command(Apple key)-8

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