Q: Unable to Reinstall OSX Yosemite via USB Stick on Macbook Pro Mid 2015
I work on a help desk and I have access to various Macbook Pro's at my disposal. When we need to reinstall OSX we just use a USB Thumb Drive that I have created with the Yosemite Installer with this command in terminal:
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app
We just got a new batch of the Retina 15 inch Mid 2015 models and the installer will not boot. I have confirmed this issue with 5 of our new Mid 2015 models. The stick still will run on our older MBPs (Mid 2014).
When booting the machine while holding option, the USB drive is there but when I select it, I get a black screen with a circle with a line going through it. I initially thought maybe there is some driver change or something that may not be on my USB installer so I went back and re-downloaded Yosemite only to run into the same error.
I'm open to any other suggestions anyone may have.
Thank you
MacBook Pro with Retina display, OS X Yosemite (10.10.3), null
Posted on Jun 16, 2015 1:16 PM
An option that you might use is to boot the MBP with the OPTION + COMMAND + R keys.
The result should be a display with a revolving globe.
Follow the directions and you will be connected to the Apple servers.
You will have a 4 option menu from which you can select Disk Utility. Erase the SSD and format the SDD to Mac OS Extended (Journaled).
Then select from the 4 option menu, to install the OSX. It will be the one that the MBP came with.
Ciao.
A solid Internet connection will be required.
Posted on Jun 16, 2015 3:16 PM