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kimac: iMac CRT- No display, yet video out works

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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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