Fix: Mac Won’t Wake from Sleep After Updating Catalina

Fix: Mac Won't Wake from Sleep After Updating Catalina

Normally, Mac users face a common issue after updating to macOS. That is the System running slow and freezes, the battery draining too fast, and so on. Sometimes, users may get a black unresponsive screen when they wake from sleep mode. If you are one among them, then follow the upcoming guide to resolve these issues quickly.

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Fix 1: Check the Settings using Terminal

  • Launch Terminal using spotlight search.
  • Type the following command and hit on the “Enter” key.
            pmset -g custom

Note: Look for the default settings Hibernate as “3” and Standby as “1”.

Check value by Terminal 1

  • Now, check the standby value should be as “1”. If not, then type the following command and hit Enter.
           Sudo pmset standby 1
  • Now, enter your System Password and again hit Enter.

Set Standby value

  • Then, check the standby value by entering the command and hitting Enter.
             pmset -g custom
  • If the standby value has been changed, then Restart your Mac.
  • If the above solution doesn’t work for you then follow the next one.

Fix 2: Reset SMC and NVRAM


  • Power Off the Mac and unplug from power.
  • Wait for a few seconds and power on your Mac.
  • Immediately, press and hold the shift +ctrl+option keys and Power button at the same time until you get the second start-up sound.
  • Now, release the keys and plug the Power cord.
  • Check the Power cord light blinks.

Reset SMC


  • Restart your Mac.
  • Immediately press and hold the cmd+option+P+R keys until the Apple logo appears on the screen.


Fix 3: Reinstall macOS

  • Restart your Mac.
  • Immediately press and hold the cmd+R keys until the spinning globe logo appears on the screen.
  • Now, select and connect to the Network.
  • Then, choose “continue” and agree with the terms.
  • Now, select the hard drive and click on the “install” option.

reinstall MacOS

If still, the problem persists on your device. Then Contact Apple support. If the above guide solves your issues let me know in the comments section below. Thank you…

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