In the event of a serious problem with your Mac, you may need to reinstall your Mac operating system. There’s a simple way to do this using your Mac Recovery partition or via Mac Internet Recovery.

Lastly, if your Mac supports Internet Recovery, then you can use this by holding Option-Command-R at startup instead of just Command-R. This will load the same recovery tools from Apple's servers that ...

If your Mac is having problems, macOS has multiple keyboard combinations that you can hold to recover your system, start in safe mode, run diagnostics, and more. Here's how to use them. Apple's macOS ...