Continue to hold until you hear the startup chime for the second time. The instructions are given the Apple web site: Create a bootable installer for OS X. Answer: A: Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. You then use the USB drive to install OS X on your Mac. You can then transfer the download to a USB drive. From this, you can go to the App Store and download and install newer versions of OS X.Īn alternative would be to use another Mac to download OS X. You can use Internet Recovery to install the version of OS X that came with your machine. Also, I do not know if you were using Core Storage and if so, how this would effect the ability to erase the Recovery partition.Įvidentially, you can now only boot using OS X Internet Recovery. Evidently, this would be much harder (or perhaps impossible) to do if El Capitan was installed. There is the possibility you could have erased the Recovery partition by using the Disk Utility if you had Yosemite installed. The tags you placed on the question suggest you have upgraded to El Capitan (OS X 10.11). Your model Mac was shipped with Yosemite (OS X 10.10) installed.
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