How can I fix my Macbook Pro without operating system?
Try booting into Internet Recovery (command – option/alt – R on a restart). It is a slow process. This will install the newest OS that the computer is compatible with. Reformat the drive using Disk Utility/Erase Mac OS Extended (Journaled), then click the Option button and select GUID.
How do I fix missing OS on Mac?
Boot your Mac while holding the ⌘ Command and R keys. In a minute or two you will get to the macOS recovery screen which will allow you to log into WiFi (if you are not already using ethernet) and reinstall macOS. The system will query Apple’s servers over the internet and download the latest version your Mac supports.
How do you reset a macOS?
To reset your Mac, first restart your computer. Then press and hold Command + R until you see the Apple logo. Next, go to Disk Utility > View > View all devices, and choose the top drive. Next, click Erase, fill out the required details, and hit Erase again.
What happens when you reinstall macOS?
2 Answers. It does exactly what it says it does–reinstalls macOS itself. It only touches operating system files that are there in a default configuration, so any preference files, documents and applications that are either changed or not there in the default installer are simply left alone.
How do I factory reset my Macbook Pro with USB?
When you have got hold of the installer for the version of macOS that you require, follow these steps:
- Attach your USB flash drive to your Mac.
- Open Disk Utility.
- Select the volume (under External) in the sidebar.
- Click Erase.
- Make sure it says “Untitled” in the Name field.
- Open Terminal.
Should I factory reset my MacBook pro?
Resetting your MacBook Pro to the way it was when you got it from the factory isn’t difficult, but it isn’t quick, either. You could do it if you’ve been consistently having serious problems with the MacBook Pro. However, the only time you should definitely do it is when you’re about to sell or give away the machine.
When you reinstall macOS do you lose everything?
2 Answers. Reinstalling macOS from the recovery menu does not erase your data. However, if there is a corruption issue, your data may be corrupted as well, its really hard to tell.