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Apple Computing Products:
macOS - Desktop Hardware
Mac Pro early 2009 video problems
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<blockquote data-quote="harryb2448" data-source="post: 1731464" data-attributes="member: 42497"><p>As you found out not necessary to select the thumb drive to boot from in System Preferences, just boot and hold down 'C'. Turn everything off, unplug from power, keyboard, display etc and leave it overnight and hook up again and try. Next step is to remove graphics card, give it a clean, reaseat firmly and hook up both power leads.</p></blockquote><p></p>
[QUOTE="harryb2448, post: 1731464, member: 42497"] As you found out not necessary to select the thumb drive to boot from in System Preferences, just boot and hold down 'C'. Turn everything off, unplug from power, keyboard, display etc and leave it overnight and hook up again and try. Next step is to remove graphics card, give it a clean, reaseat firmly and hook up both power leads. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Mac Pro early 2009 video problems
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