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Apple Computing Products:
macOS - Operating System
iMac Black Screen
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<blockquote data-quote="chscag" data-source="post: 1459426" data-attributes="member: 46727"><p>If an external monitor works OK, it has to be something related to the iMac display that's not working properly. First, make sure that the display is not sleeping all the time by resetting the System Management Controller.</p><p></p><p>Do this: Remove the external monitor. Shut the iMac down completely, remove the AC cord from the outlet. Let the machine stay off for at least 10 minutes. Plug it back in and turn it on. Let us know.</p></blockquote><p></p>
[QUOTE="chscag, post: 1459426, member: 46727"] If an external monitor works OK, it has to be something related to the iMac display that's not working properly. First, make sure that the display is not sleeping all the time by resetting the System Management Controller. Do this: Remove the external monitor. Shut the iMac down completely, remove the AC cord from the outlet. Let the machine stay off for at least 10 minutes. Plug it back in and turn it on. Let us know. [/QUOTE]
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Apple Computing Products:
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