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Apple Computing Products:
macOS - Desktop Hardware
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<blockquote data-quote="gsahli" data-source="post: 1582969" data-attributes="member: 182015"><p>chscag gave you a way to test if the internal monitor is the problem. </p><p>No one can fix anything without first narrowing down the problem.</p><p>You can try resetting parameter ram, by holding down command-option-p-r immediately after the startup sound, and hold it until the sound repeats.</p></blockquote><p></p>
[QUOTE="gsahli, post: 1582969, member: 182015"] chscag gave you a way to test if the internal monitor is the problem. No one can fix anything without first narrowing down the problem. You can try resetting parameter ram, by holding down command-option-p-r immediately after the startup sound, and hold it until the sound repeats. [/QUOTE]
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