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May 7, 2013 8:49 AM in response to Chris999999999by mario49,Morning Chris999999999,
Learn how to troubleshoot your Apple computer if it is having issues with video on internal or external displays.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
How to use multiple displays with your Mac
http://support.apple.com/kb/HT5019
Hope this helps,
Mario
