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Apple Computing Products:
macOS - Operating System
Screen freezing/pixelating when I power on my iMac 24
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<blockquote data-quote="chscag" data-source="post: 1530258" data-attributes="member: 46727"><p>It sounds like it may have something to do with the graphics card in your iMac. I'm not certain if your model has a separate graphics card or if it's integrated within the logic board.</p><p></p><p>Try starting up your iMac in safe boot mode to see if the same thing occurs. Press and hold down your shift key as soon as you hear the bong sound and continue holding it until you get the spinning circle. You might also want to try a SMC reset: Shut down your iMac and remove the AC plug from the power outlet. Let it sit for around 5 minutes or so and then plug it back in and reboot.</p></blockquote><p></p>
[QUOTE="chscag, post: 1530258, member: 46727"] It sounds like it may have something to do with the graphics card in your iMac. I'm not certain if your model has a separate graphics card or if it's integrated within the logic board. Try starting up your iMac in safe boot mode to see if the same thing occurs. Press and hold down your shift key as soon as you hear the bong sound and continue holding it until you get the spinning circle. You might also want to try a SMC reset: Shut down your iMac and remove the AC plug from the power outlet. Let it sit for around 5 minutes or so and then plug it back in and reboot. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Screen freezing/pixelating when I power on my iMac 24
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