iMac Shuts Down in Sleep Mode? Here’s the Fix


Many people have a complaint that their iMac shuts down when put to sleep mode. Sometimes it keeps shutting down unexpectedly. Here I am going to tell you the solutions to fix this issue.
Before trying these solutions,

  1. Disconnect all peripheral devices like printer, scanner, mouse, keyboard, webcam, etc from your Mac.
  2. Check whether there is any magnet near to your Mac. Because Magnets will make your Mac shuts down.
  3. Click on the Trackpad to wake up your Mac. If your Mac doesn’t wake up, click again and again on Trackpad.

Solution 1: Wake up your Mac

  1. Just press the Power Button to wake up your Mac from sleep.
  2. If it doesn’t work out, press and hold the Power Button until your Mac wakes up.

Solution 2: Change sleep timer for Computer and display

  1. Go to Apple Menu->System Preferences->Energy Saver.
  2. Select “Battery” tab.
  3. Here you can see two options. One is Computer sleep and another one is Display sleep.
  4. Set Computer sleep to Never and Display sleep to 15 min.
  5. To set Computer sleep to Never, drag the slider until it reaches Never (at the right corner).
  6. Select “Power Adapter” tab. Follow the steps 4 & 5.

Solution 3: Reset SMC

  1. Turn off your iMac via Apple Menu->Shut Down.
  2. Disconnect the power cord from your Mac.
  3. Wait for 15-20 seconds.
  4. Connect the power cord to Mac.
  5. Wait for 5 seconds and then turn on your iMac by pressing the Power Button.

Solution 4: Reset NVRAM/PRAM

  1. Turn off your Mac via Apple Menu->Shut Down.
  2. Press the Power Button to turn on your Mac.
  3. Then immediately press and hold the Option + Command + P + R keys simultaneously as quickly as possible after pressing the Power Button.
  4. Keep pressing until you hear the startup sound for the second time.

Solution 5: Restart your Mac in Safe Mode (Safe Boot)
Restart your Mac in Safe Mode will fix many issues on your Mac. But you can’t use some features in Safe Mode.

  1. Press and hold the Power Button to turn off your Mac.
  2. Turn on your Mac.
  3. Press and hold the Shift Key as quickly as possible after you hear the startup sound.
  4. Keep pressing the Shift Key until you see the Login Window.
  5. Enter your User Name & Password to login.

Note: Turn off “FileVault” before restarting your Mac in Safe Mode. You may need to login twice if FileVault is turned on.
Solution 6: Disable “Put hard disk to sleep when possible”

  1. Go to Apple Menu->System Preferences->Energy Saver.
  2. Select “Battery” tab.
  3. Unselect the checkbox next to “Put hard disk to sleep when possible”.
  4. Select “Power Adapter” tab.
  5. Unselect the checkbox next to “Put hard disk to sleep when possible”.

Solution 7: Reinstall macOS
Reinstalling high Sierra may solve your problem.

  1. Press and hold the Power Button to shut down your Mac. then turn on it.
  2. Press and hold the Command + R keys simultaneously as soon as possible after pressing the Power Button.
  3. Keep pressing Command + R keys until the Apple Logo appears.
  4. After that macOS Utilities window will appear with 4 options. Tap “Reinstall macOS”.
  5. Tap “Continue”.
  6. You will be prompted to choose your hard disk/drive. If you are not asked to select your disk, tap “Show All Disks”. You may need to enter your Apple ID.
  7. Tap “Install”. Wait until the installation process is completed.
  8. Your Mac will restart after completing the installation.

Other solutions:

  1. Create a new user account and use it.
  2. Check Apple warranty status. If your iMac covers warranty, take it to the Apple Service Center.

If you know any other solutions to fix this issue, let us know through your comments.

7:09 am

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