How to Fix Sleep Wake Failure in macOS High Sierra?

Upgrading to macOS High Sierra has a lot of pros and cons. Sleep wake failure is one of the issues many irritated Mac owners face quite often after the upgrade.

After switching to version 10.13.2 particularly, many users noticed this problem. The computer finds it hard to wake up from sleep. No matter whether you prefer MacBook Pro, iMac, or another model of Apple computer, you may experience this problem.

The main question is whether a user can solve it all alone with the help of built-in utilities or third-party apps or is it Apple’s responsibility to wake up the machine?

Setting up a Sleep Mode

First of all, where does this sleep mode come from? Is it an obligatory function? Of course, it is not a mandatory feature, but it is pretty useful for those Mac owners who may stop using their devices for a while and forget to turn them off. It is a must for both security purposes and energy-saving goals. One can put an Apple computer to sleep after a specified continuation of inactivity. It is possible to specify when the computer should wake up as well.

  1. Select the Apple menu and move to System Preferences. Click on the Energy Saver option.
  2. Do one of the following:

turn display off

  • Decide on the amount of time the device/screen should wait before falling asleep. Drag the “Computer Sleep”/” Display Sleep” options.
  • Prevent the computer from going to sleep automatically. Pick “Prevent computer from sleeping automatically…”
  • Make hard disk sleep when you want. You can see a “Put hard disks to sleep…” option.
  • In order to have a machine on while the power is available, choose “Start up automatically…”
  • Make it possible for a computer to wake shortly to be able to access shared services. Use “Wake for…” feature and specify.

Wake up Your Apple Computer from Long Sleep!

So, are you facing a gray screen, blue screen, or flickering pictures on websites? If yes, try one of the offered options to solve the issue (or at least try to solve it).

  1. Reset NVRAM. Switch off the Apple computer. After that, switch it on and press the Cmd, Option, P, and R keys altogether. Make sure you have heard a couple of chimes/the screen coming on and going off two times.
  2. Then, turn off the machine and reset the System Management Controller (SMC). Push Shift, Control, and Option and keep holding this combination along with the power button for ten seconds.

This solution may help in various situations. Except for the offered troubleshooting steps like resetting SMC/VRAM, there is one more thing official Apple’s support and other experts recommend doing. Try to simply reinstall macOS using Recovery mode.

To do that, please follow these instructions:

  1. Check whether you have a strong Wi-Fi connection. Avoid using public Wi-Fi for this purpose.
  2. Switch off the computer in the Apple menuàShut Down. In case the operating system is not reacting, push and hold the power button.
  3. Wait until 30 seconds pass.
  4. Push the power button to turn the Mac on again.
  5. Keep on pressing the Command and R keys before you hear the chime noise.

After that, download the target OS X or macOS and reinstall it. It may take a while. Knowing an Apple ID and password are a must.

After entering the login details, pick Install Mac OS X and Continue in the OS X Utilities menu. The process should start then. Just stick to the prompts you’ll see on your screen to complete the installation.