Trouble booting from USB?
I have two MBP's that I am have difficulty installing OS X on. I replaced the HDD's and went to install OS sierra on both machines. I got them to boot from the flash drives (start-option) and they both are just stuck at the apple load screen, both in the exact same location as well, with no progress. I tried resetting SCM, PRAM, I've swapped out the RAM, even tried different HDD's. I am at a loss. I know the bootable flash drives work because I just installed OS X on a few iMacs. My next step is to just clone the drives from a working computer, but I want to know what is going on. I have also tried El Cap bottle flash drives with no luck. Thanks.
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Upate: So I remade my flash drive, no luck ( I didn't think this was he issue as Ive installed off these things countless times on all sorts of machines). I replaced the HDD cable, no luck. I pulled the HDD out of a working machine, and it wouldn't boot from that. Simply out of curiosity I booted from Ubuntu and it booted.... Worked just fine. This MacBook Pro wants nothing to do with mac os.... Because Ubuntu worked via usb I figured I'd trying to boot the HDD from the working machine via USB (HDD in external enclosure. Does not seem to be working. This computer is on its way to being a linux machine... LOL
by Taylor Struna