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Apple Computing Products:
macOS - Operating System
iMac- black screen issues?!
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<blockquote data-quote="chscag" data-source="post: 1346660" data-attributes="member: 46727"><p>It sounds like a power memory problem. Let's try resetting the System Management Controller first. Do this:</p><p></p><p>Power off the iMac and then remove it from the AC mains for about 5 minutes or so. Plug it back in, power up and boot. That will reset the System Management Controller. If the problem persists after doing that, make an appointment with your local Apple store genius bar and take it on in.</p></blockquote><p></p>
[QUOTE="chscag, post: 1346660, member: 46727"] It sounds like a power memory problem. Let's try resetting the System Management Controller first. Do this: Power off the iMac and then remove it from the AC mains for about 5 minutes or so. Plug it back in, power up and boot. That will reset the System Management Controller. If the problem persists after doing that, make an appointment with your local Apple store genius bar and take it on in. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
iMac- black screen issues?!
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