My display has gone funny colurs

My display has turned weierd colours how do I get back to what it was a few hours ago?

Hi there alunbidmead,
You may find the troubleshooting steps in the article below helpful.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
-Griff W. 

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    Hi
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    Dr. Smoke
    Author: Troubleshooting Mac® OS X
    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
    I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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    Welcome to Apple Discussions
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    After a few reboots of my Mac, reconnects to the display, and restarts of iTunes, the problem seems to be gone. I am unable to reproduce it now. So, yay! But for a while I was quite concerned. I haven't the slightest idea what was causing this problem, but there were many factors at play. Like playing to multiple sources in iTunes, equalizer settings, etc. I jut simply don't know enough about the technology.

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    Open the Universal Access pane of System Preferences, click on the Seeing tab, turn off White on Black, and drag the Contrast slider all the way to the left.
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