If it continues to fail to boot
What we want to do here is reset the hardware power then reset the system settings using the SMC and NVRAM resets.
If it then continues to fail to boot to recovery then it likely is a hardware issue.
To reset the SMC, please follow these steps:
Reset the System Management Controller on MacBooks:
1. Shut down your Mac.
2. On your built-in keyboard, press and hold all of these keys: SHIFT – CONTROL – OPTION.
3. While holding all three keys, press and hold the power button as well.
4. Keep holding all four keys for 10 seconds.
5. Release all keys, then press the power button to turn on your Mac.
Then to reset the NVRAM:
How to reset NVRAM
Shut down your Mac, then turn it on and immediately hold down these four keys together: Option, Command, P, and R.
Keep holding the keys for about 20 seconds, during which your Mac might appear to restart.
Start up your Mac in safe mode
Starting up your Mac in safe mode can help you identify whether issues you’re experiencing are caused by software that loads as your Mac starts up.
Before you begin
To start up your Mac in safe mode, you need to know what type of Mac you have.
- On your Mac, choose Apple menu
- Look at the information in the window to determine what type of Mac you have:
- If you see an item labeled Chip, followed by the name of the chip, you have a Mac with Apple silicon.
- If you see an item labeled Processor, followed by the name of an Intel processor, you have an Intel-based Mac.
- Use the corresponding set of instructions below to start up your Mac in safe mode.
Start up your Mac with Apple silicon in safe mode
- On your Mac, choose Apple menu
- Press and hold the power button on your Mac until “Loading startup options” appears.
- Select a volume.
- Press and hold the Shift key, then click Continue in Safe Mode.The computer restarts automatically. When the login window appears, you should see “Safe Boot” in the menu bar.
Start up your Intel-based Mac in safe mode
- Turn on or restart your Mac, then immediately press and hold the Shift key until you see the login window.
- Log in to your Mac.
- You might be asked to log in again.On either the first or second login window, you should see “Safe Boot” in the menu bar.
Verify your Mac started up in safe mode
If you’re unsure whether your Mac started up in safe mode, you can use the System Information app to check the mode.
- On your Mac, press and hold the Option key, then choose Apple menu
- In the System Information app, select Software in the sidebar.
- In the System Software Overview, look at the value listed next to the item labeled Boot Mode.
- Safe: The Mac is using safe mode.
- Normal: The Mac is not using safe mode.
