电脑自动重启未解决，升级卸载无效后无法安装操作系统求助

Hey Teusz, sorry to hear you’re stuck in this frustrating cycle of boot crashes and failed reinstalls—let’s work through this systematically to get your Mac back on track.

First, Rule Out Quick Hardware/Software Resets #

Start with these quick fixes that often resolve boot-related glitches:

• Reset NVRAM/PRAM: Shut down your Mac, then press the power button and immediately hold Command + Option + P + R. Keep holding until you hear the second startup chime, then release. This resets low-level system settings that might be causing crashes.
• Reset SMC: The steps vary by Mac model:
  • For Macs with Apple T2 Security Chip: Shut down, hold the power button for 10 seconds, release, then press the power button again to turn it on.
  • For older Macs (no T2): Shut down, hold Shift + Control + Option + Power Button for 10 seconds, release all keys, then press the power button to start.

Try Booting into Safe Mode #

Booting into Safe Mode disables third-party extensions and startup items, which can help isolate the issue:

1. Shut down your Mac, then turn it on and immediately hold the Shift key.
2. Release the key when you see the login window.
   If you can successfully boot into Safe Mode:

• Open Terminal and run kextstat | grep -v com.apple to list all third-party kernel extensions.
• Use sudo kextunload -b com.xxx.yyy (replace with the actual extension ID) to unload problematic kexts, or manually delete them from /Library/Extensions.

Fix Reinstallation Failure #

Since you’ve already tried reinstalling and it’s failing, let’s address the disk and installation media:

1. Verify & Repair Your Startup Disk:
   • Boot into Recovery Mode (hold Command + R on startup).
   • Open Disk Utility, select your startup disk from the sidebar, then click "First Aid". Let it run to repair any disk errors or permission issues.
   • If errors persist, you may need to erase the disk (since your data is in the cloud): Select the disk, click "Erase", choose APFS as the format, then proceed with reinstallation.
2. Create a Bootable Install USB:
   • On another working Mac, download the macOS High Sierra installer (from the App Store or Apple’s support archives).
   • Format a USB drive (16GB+ as Mac OS Extended (Journaled)), name it InstallMedia.
   • Open Terminal and run this command (adjust paths if your installer is in a different location):

     sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/InstallMedia --applicationpath /Applications/Install\ macOS\ High\ Sierra.app
     

   • Plug the USB into your problematic Mac, boot while holding Option, select the USB drive, then attempt reinstallation from there.

Check for Hardware Issues #

If none of the above works, it’s time to rule out hardware problems:

• Boot into Apple Diagnostics (hold D on startup) and run the full hardware test. Note any error codes—these can point to faulty RAM, a failing SSD/HDD, or other hardware issues that need professional repair.

Hope these steps help you resolve the issue! Let me know if you hit any roadblocks along the way.

内容的提问来源于stack exchange，提问作者Teusz