I have a mid 2012 macbook pro
I just took out the optical drive put my main hdd in its place and installed a 525 gb ssd in the original hard drive slot.
I've been trying to install osx on it for the past 2 hours using alt/option but the computer just boots up on the hdd hard drive even after selecting the usb
Any help is greatly appreciated...as I'm close to throwing my computer out the window.
fyi this did not work. How to Install OS X on new hard drive on a Late 2012 Mac mini