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Apple encourages you to first seek a solution at Apple Support.
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Upgrading to Mac OS 9.1 or higher may yield a display that doesn't work on the internal display yet the external display works. To fix, you should update the firmware from this article:
http://docs.info.apple.com/article.html?artnum=86117
Preferably you should update your firmware before upgrading to Mac OS 9.1 or later.
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