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Support > Useful links

Here are links to documents on the Apple support site and miscellaneous news sites for quick access to some useful technical information.

- How to use Apple Diagnostics on your Mac

- About macOS Recovery

- How to reinstall macOS

- Reset permissions of items in your home folder

- How to Reset NVRAM on your Mac

- If a flashing question mark appears when you start your Mac

- If you see a blue screen at startup

- If you see a gray screen at startup

- Recover your entire system

- How to reset the System Management Controller (SMC) on your Mac

- Resolve startup issues and perform disk maintenance with Disk Utility and fsck

- Use safe mode to isolate issues with your Mac

- How to Repair a Mac Disk with fsck from Single User Mode