If your Mac is unable to start up from its built-in hard drive, you can use Internet Recovery to reinstall the operating system. This will erase your hard drive and install a fresh copy of macOS.
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To use Internet Recovery, make sure your Mac is connected to the Internet, then follow these steps:
1. Restart your Mac.
2. As soon as you hear the startup chime, hold down the Option key.
3. When the Startup Manager appears, select the Recovery HD disk.
4. Wait for the Mac OS X Utilities window to appear.
5. In the Utilities window, select Reinstall macOS and click Continue.
6. Follow the onscreen instructions to reinstall macOS.
What is Mac in Internet Recovery Mode and what are its benefits
Mac in Internet Recovery Mode is a special boot mode that allows you to reinstall the macOS operating system on your Mac. This can be useful if your Mac is having problems starting up from its built-in hard drive, or if you want to erase your hard drive and start fresh with a new installation of macOS.
One of the benefits of using Internet Recovery Mode is that it can help you troubleshoot problems with your Mac. If you are having trouble starting up from your hard drive, for example, you can use Internet Recovery Mode to see if the problem is with your hard drive or with another component of your Mac. Another benefit of using Internet Recovery Mode is that it can help you save time when reinstalling the macOS operating system. If you need to erase your hard drive and start fresh with a new installation of macOS, you can use Internet Recovery Mode to do this quickly and easily.
How to start up your Mac in Internet Recovery Mode
There are a few different ways to start up your Mac in Internet Recovery Mode. One way is to restart your Mac and hold down the Option key as soon as you hear the startup chime. This will bring up the Startup Manager, which you can use to select the Recovery HD disk and start up from it.
Another way to start up your Mac in Internet Recovery Mode is to use the built-in Apple Hardware Test or Apple Diagnostics. To do this, restart your Mac and hold down the D key as soon as you hear the startup chime. This will bring up the Apple Hardware Test or Apple Diagnostics, which you can use to select the Recovery HD disk and start up from it. Once your Mac has started up in Internet Recovery Mode, you will see the macOS Utilities window. From here, you can choose to reinstall macOS, restore from a backup, or troubleshoot your Mac.
What to do if you can’t start up your Mac in Internet Recovery Mode
If you can’t start up your Mac in Internet Recovery Mode, there are a few things you can try. One thing you can try is to reset the NVRAM or PRAM on your Mac. To do this, restart your Mac and hold down the Option+Command+P+R keys as soon as you hear the startup chime. Keep holding these keys until your Mac restarts and you hear the startup chime again.
Another thing you can try is to connect your Mac to another Mac using a Thunderbolt cable and start up in Target Disk Mode. Once your Mac is in Target Disk Mode, you should see it appear as a drive on the other Mac.