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Apple Computing Products:
macOS - Operating System
How to determine cause of iMac "blacking out"?
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<blockquote data-quote="chas_m" data-source="post: 1665581"><p>Well, let's back up a bit. You say first that the Mac is "shutting down" on you instantly -- a sure sign of either overheating, a bad temperature sensor, or a failing power supply. Later you describe it as "blacking out," which implies that the machine is still running but the display cuts out -- which would be a graphics card/chipset issue. Which is it?</p><p></p><p>Really, though, any of those possible issues warrants a trip to the Genius Bar.</p></blockquote><p></p>
[QUOTE="chas_m, post: 1665581"] Well, let's back up a bit. You say first that the Mac is "shutting down" on you instantly -- a sure sign of either overheating, a bad temperature sensor, or a failing power supply. Later you describe it as "blacking out," which implies that the machine is still running but the display cuts out -- which would be a graphics card/chipset issue. Which is it? Really, though, any of those possible issues warrants a trip to the Genius Bar. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
How to determine cause of iMac "blacking out"?
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