Why is my MacBook not sleeping when the lid is closed?

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Why is my MacBook not sleeping when the lid is closed?

I am experiencing an issue with my MacBook where it doesn’t go to sleep when I close the lid. Instead of entering sleep mode, the computer seems to stay awake, and I can hear the fans running or feel the heat emanating from the device. This behavior persists even though I have checked my power settings and ensured that the system is configured to sleep when the lid is closed. This problem is frustrating, especially since I rely on my MacBook’s sleep function to save battery life and protect the device during transport. I’ve tried restarting the system and ensuring that no external devices are connected, but the issue remains unresolved. I’m concerned this could lead to potential hardware damage or increased power consumption over time.

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In some cases, this problem can stem from misconfigured power settings. Here’s how I fixed a similar issue on my MacBook:

  1. System Preferences: Go to System Preferences > Energy Saver. Make sure the “Prevent computer from sleeping automatically when the display is off” checkbox is unchecked.
  2. Check Firmware Updates: Sometimes, outdated firmware might cause this glitch. Ensure you have the latest macOS updates installed. Go to System Preferences > Software Update and check for any available updates.
  3. Bluetooth Devices: Paired Bluetooth devices can wake your MacBook. Turn off Bluetooth or unpair devices you don’t need.

These adjustments resolved the issue for me.

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I found that certain system-level settings and applications can prevent a MacBook from sleeping when the lid is closed. Here are detailed steps to address the problem:

  1. Recheck Energy Saver Preferences:
  2. Open System Preferences.
  3. Go to Energy Saver.

  4. Ensure the “Prevent computer from sleeping automatically when the display is off” isn’t selected.

  5. SMC and PRAM Reset:

  6. Perform a System Management Controller (SMC) reset. Shut down your MacBook, press Shift + Control + Option + Power button for about 10 seconds.

  7. For the PRAM reset, restart and hold ‘Command + Option + P + R’ until you hear the startup sound a second time.

  8. Inspect for Third-Party Applications:

  9. Check for apps like InsomniaX or Caffeine which are designed to prevent sleep.

  10. Uninstall these apps if they are causing issues.

  11. Peripherals:

  12. Sometimes external peripherals like mice or webcams actively prevent sleep. Disconnect these devices before closing the lid.

Following these comprehensive steps might resolve the sleeping issue.

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If your MacBook is not sleeping when the lid is closed, it might be due to an application running in the background preventing it from entering sleep mode. Here’s what you can do:

  1. Check Activity Monitor: Open Activity Monitor from the Utilities folder in your Applications. Look for any high CPU usage. Some apps or processes may keep the MacBook awake.
  2. Reset SMC: The System Management Controller (SMC) controls sleep functions. Resetting it can resolve sleep issues. Shut down the MacBook, press Shift-Control-Option and the power button for 10 seconds, then release and turn it on.
  3. Close Background Apps: Ensure all unnecessary apps are fully closed before you shut the lid. Some apps might not intervene with sleep settings.
  4. External Devices: Disconnect all connected peripherals, as some might prevent sleep mode.

These steps can help identify the cause and fix the issue.

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I’ve encountered the same problem with my MacBook. The cause turned out to be an external monitor. If you’re using an external display, your MacBook might not sleep properly when the lid is closed. Here are a few things to try:

  1. Disconnect the External Monitor: Before closing the lid, disconnect your MacBook from the external display.
  2. Change the Monitor Settings: Adjust the monitor settings to ensure it doesn’t interfere with the MacBook’s sleep settings.
  3. Use Clamshell Mode: Sometimes forcing the MacBook into clamshell mode by connecting an external keyboard and mouse can help. Then close the lid and let the MacBook enter sleep mode.
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