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What should I do if my MacBook Pro wont boot?
Download and install the OS X El Capitan 10.11.6 Combo Update or 10.12.6 Combo Update or Download macOS High Sierra 10.13.3 Combo Update as needed. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
Why does macOS install from USB hang when booting?
Click to expand… This is due to USB port not allowing transfer of files from your macOSSierra USB Installer. Transferring the USB installer to another USB 2.0 port (I presume you have a USB 2.0 Flash Disk) preferably at the back and try booting. You may have to try a few ports to find the right one.
How do you reinstall OS X on a Mac?
Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button. Erase and Install OS X Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears.
How to get out of Mac OS Installation loop?
Click on the Erase icon in Disk Utility’s toolbar. A panel will drop down. Set the Format type to APFS (for SSDs only) or Mac OS Extended (Journaled.) Click on the Apply button, then wait for the Done button to activate and click on it.
Shut down your Mac. If your Mac has no response, you can press and hold the Power button for a while to force shut down the computer. Press the Power button and immediately press & hold Command-Option-R or Command-Alt-R (on some Mac keyboards, there is an Alt key rather than an Option key).
What to do when Mac wont boot into safe mode?
Booting your Mac into Safe Mode can check issues on your Mac’s startup drive and automatically repair any issue it discovers. Shut down your Mac. 10 seconds later, you need to press the Power button and immediately press & hold the Shift key. When you see the login screen, you can release the Shift key.
Is there a bootable USB in OS X Yosemite?
For what it’s worth, when I plug in this drive into my working MBP, I see the “Install OS X Yosemite” get mounted in Finder. Here is a screenshot of the “Startup Disk” option within “System Preferences” on my working MBP that has the Bootable USB plugged in – which proves that it was properly created, I believe.
How to boot USB stick on MacBook Pro?
Power on the Mac, then immediately hold option, command, p and r. You need to do this before the grey screen appears. Hold down the keys until you hear the startup sound twice, then release them. Plug in the bootable USB stick, restart the Mac, and hold option.