MacBook Air Won’t Boot: Fixing the Issue
## Direct Answer
If your MacBook Air won’t boot, it’s likely due to a software or hardware issue. Try resetting the System Management Controller (SMC) and the Power Management Unit (PMU), or booting in Safe Mode to isolate the problem.
## Step-by-Step Guide
To troubleshoot the issue, follow these steps:
1. **Reset the SMC**: Shut down your MacBook Air, locate the following keys: Power button, Command (⌘) + Option (⌥) + Shift (⇧) + Power button. Press and hold these keys while powering on your MacBook Air. Release the keys when you hear the boot chime for the second time.
2. **Reset the PMU**: Shut down your MacBook Air, locate the Power button, and the Power cord. Unplug the power cord, press and hold the Power button for 10 seconds. Release the Power button, plug in the power cord, and press the Power button to turn on your MacBook Air.
3. **Boot in Safe Mode**: Shut down your MacBook Air, press the Power button, immediately hold down the Shift (⇧) key. Release the Shift key when you see the login window.
4. **Run a Diagnostic Test**: Restart your MacBook Air, immediately hold down the ‘D’ key. This will run a diagnostic test to identify any hardware issues.
## FAQ
– **Q: What if my MacBook Air is still under warranty?**
A: If your MacBook Air is still under warranty, contact Apple Support for assistance and potential repair or replacement.
– **Q: Can I boot my MacBook Air in Target Disk Mode?**
A: Yes, shut down your MacBook Air, press the ‘T’ key while powering on. This allows you to access your MacBook Air’s hard drive from another Mac.
– **Q: How do I reinstall macOS if my MacBook Air won’t boot?**
A: Restart your MacBook Air, immediately hold down Command (⌘) + R. This will boot your MacBook Air into Recovery Mode, where you can reinstall macOS.
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