Imac Start From Usb
Reasons for Mac Boot from USB. Booting the Mac from USB in a way gives the power back to the. The OS on my Mac recently stopped working and in order to fix the issue I needed to use a bootable USB drive to reinstall the OS. I'm going to take you thro. Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media). D Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you're using. Here are the steps I took to create the bootable USB drive (I have a Mid-2014 MacBook Pro with Retina Display): Downloaded the latest OS X El Capitan (10.11.3) from the Mac App Store. Created a bootable USB drive using createinstallmedia (as explained in Apple’s documentation) and it went well. Erased Macintosh HD. Tried booting from USB drive. Startup 9.2.1 repairs problems that may occur when Mac OS 9.1 and Mac OS X are on the same partition and a version earlier than Startup 9.2 has been used.
Try to start up from macOS Recovery
If your Mac seems to be turned on but nothing appears on your display, determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
Apple silicon
- Press and hold the power button for about 10 seconds.
- You should see the startup options window, which includes a gear icon labeled Options. Select Options, then click Continue.
- If you never see the startup options window, release the power button, then press and hold it again for another 10 seconds. If the issue persists, please contact Apple Support.
Intel processor
- Press and hold the power button for about 10 seconds.
- Press and release the power button, then immediately press and hold Command (⌘)-R until you see an Apple logo or other image.
- If you still see a blank screen after about 20 seconds, contact Apple Support.
Use Disk Utility to repair your startup disk
If your Mac successfully started up from macOS Recovery, you should see a utilities window that includes Disk Utility. Use Disk Utility to repair your startup disk.
Imac Start From Usb Adapter
Imac Start From Usb Flash Drive
If Disk Utility found no errors, reinstall macOS.
If Disk Utility found errors and repaired them, restart your Mac. If the issue returns after restarting, reinstall macOS.
If you still need help, please contact Apple Support.