What can I do about screen flickering?

I have a problem on my screen. She has trembled when I use the scroll. Is it problem on the screen, or some setting?

Hi there Markoacs,
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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