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Apple Computing Products:
macOS - Operating System
Display issues
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<blockquote data-quote="Slydude" data-source="post: 1272710" data-attributes="member: 131855"><p>You might want to have a look at the suggestions in <a href="http://support.apple.com/kb/HT1573" target="_blank">Apple computers: Troubleshooting issues with video on internal or external displays</a>. It gives some troubleshooting steps that might help. Some of the steps you have already done. The important thing is that in the external monitor section it describes which preference files might be causing a problem. If you can either Safe Boot or boot to 10.2 you should be able to get to those files, delete them and restart.</p><p></p><p>Another thought occurred to me. When you reset the PRAM the machine reboots to 10.2 correct? Use the startup pref pane in 10.2 to make the 10.4 disk the startup disk before rebooting. I think that will work.</p></blockquote><p></p>
[QUOTE="Slydude, post: 1272710, member: 131855"] You might want to have a look at the suggestions in [url=http://support.apple.com/kb/HT1573]Apple computers: Troubleshooting issues with video on internal or external displays[/url]. It gives some troubleshooting steps that might help. Some of the steps you have already done. The important thing is that in the external monitor section it describes which preference files might be causing a problem. If you can either Safe Boot or boot to 10.2 you should be able to get to those files, delete them and restart. Another thought occurred to me. When you reset the PRAM the machine reboots to 10.2 correct? Use the startup pref pane in 10.2 to make the 10.4 disk the startup disk before rebooting. I think that will work. [/QUOTE]
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