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Apple Computing Products:
macOS - Desktop Hardware
iMac with newly installed hard drive won't boot from external drive
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<blockquote data-quote="pm-r" data-source="post: 1685424" data-attributes="member: 175845"><p>Is the new drive a USB bus powered unit only or does it have an option to accept AC power adapter?? And I'm assuming you're using the same cable and have also tried other USB ports???</p><p></p><p></p><p>EDIT:</p><p>Also, have you tried resetting the SMC and or even a Safe Boot Mode, but the latter shouldn't be necessary if it was a clean virgin install.</p></blockquote><p></p>
[QUOTE="pm-r, post: 1685424, member: 175845"] Is the new drive a USB bus powered unit only or does it have an option to accept AC power adapter?? And I'm assuming you're using the same cable and have also tried other USB ports??? EDIT: Also, have you tried resetting the SMC and or even a Safe Boot Mode, but the latter shouldn't be necessary if it was a clean virgin install. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
iMac with newly installed hard drive won't boot from external drive
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