Configured hard drive for Sierra won't boot anymore

I have a working on machine on El Capitan. I want to move to Sierra but I wanted to be careful about not blowing away my current setup. I bought another SSD and swapped it with my working SSD El Capitan drive and successfully installed Sierra on it.

After installing Sierra on it, I swapped out the Sierra drive and replaced it with my El Capitan drive. Then I installed another bracket in my machine and hooked my Sierra drive (so now I have dual SSDs in my machine).

Now when I jump into the Clover drive selector screen and select the Sierra drive, I get the 'no entry' icon.

I can think of a couple of reasons, but I'm not sure what I can do:

  1. When I succcessfully installed Sierra, it was setup to be in the SATA slot that the El Capitan drive is now. It isn't now so it's hosed.
  2. Somehow my BIOS is not configured correctly.
  3. Having two bootable SSDs confuses my machine so it doesn'st let me boot off of the Sierra drive.

My question is really whether I can restore the drive in some way or if I just need to reinstall...


GIGABYTE GA-H97M-D3H Intel Core i5-4690S (Haswell) 4 GB RAM No additional video card ~iMac 15,1

submitted by /u/australianmullet
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