iMac will not wake up

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reneeaz


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Since Yosemite installation, my iMac will not wake from sleep. Just get a blue screen and have to physically turn off computer. Then, I get a message saying I shut down computer due to a problem but it does not tell me what was opened at that time and has caused the problem.
 
chscag

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Try resetting the System Management Controller: Shut down your iMac, and remove the AC plug from the outlet. Let it set for 10 minutes. Start it up and reset the PRAM at the same time. The Apple article says that it's for Mavericks but it's the same for Yosemite.
 
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reneeaz


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Seems to have sorted itself out without trying that, but thanks. I tried to make sure I turned off everything that was opened. However, is there an easy way to check which items are open in the background?
 
macnicol

macnicol


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Your Mac's Specs
2019 27" iMac, 3 GHz i5, 40gb RAM, 1TB Fusion int, 46TB ext drives, Catalina 10.15.7
Look at the Activity Monitor display. It shows ALL active applications
 
harryb2448

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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
And you will find Activity Monitor in Utilities.
 

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