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<blockquote data-quote="Randy B. Singer" data-source="post: 1885441" data-attributes="member: 190607">[URL unfurl=&quot;true&quot;]https://support.apple.com/en-us/HT210901[/URL]&quot;A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use. <ol>
<li data-xf-list-type="ol">Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.</li>
<li data-xf-list-type="ol">Turn on your Mac and immediately press and hold both Command (⌘) and R to <a href="https://support.apple.com/kb/HT201314" target="_blank">start up from macOS Recovery</a>. </li>
<li data-xf-list-type="ol">While in macOS Recovery, <a href="https://support.apple.com/kb/HT210898" target="_blank">use Disk Utility to repair your startup disk</a>.</li>
<li data-xf-list-type="ol">If Disk Utility found no errors or repaired all errors, <a href="https://support.apple.com/kb/HT204904" target="_blank">reinstall macOS</a>.&quot;</li>
</ol></blockquote>

[QUOTE="Randy B. Singer, post: 1885441, member: 190607"] [URL unfurl="true"]https://support.apple.com/en-us/HT210901[/URL] "A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use. [LIST=1] [*]Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off. [*]Turn on your Mac and immediately press and hold both Command (⌘) and R to [URL='https://support.apple.com/kb/HT201314']start up from macOS Recovery[/URL]. [*]While in macOS Recovery, [URL='https://support.apple.com/kb/HT210898']use Disk Utility to repair your startup disk[/URL]. [*]If Disk Utility found no errors or repaired all errors, [URL='https://support.apple.com/kb/HT204904']reinstall macOS[/URL]." [/LIST] [/QUOTE]

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