Late 2012 Mac mini doesn't see 840 Pro SSD after wiping/reformatting
Late 2012 Mac mini (Macmini6,2) system
In `15 I got the iFixit kit to add a second drive SSD to my 1TB HDD. I configured as boot drive/Yosemite and used HDD as storage volume (kept Mavericks on HDD) put SSD in bottom/boot slot.
Worked great til Safari issue led me to reinstall Yosemite which somehow merged both drives into a logical Fusion booting from HDD with endless performance struggles. DU reports find no issues so wiped/reformatted SSD: GUID/Journaled file system as before, but OS Installer still says Yosemite can’t be installed, plus HDD can’t be updated.
I then removed the SSD and wiped/reformatted it on MacBook Air (using a USB/SATA cable) but it still rejects OS Installation.
Put back in the Mac mini but now SSD doesn’t mount/show up at all including Disk Warrior?!
Wiped/reformatted HDD and finally got Mavericks online install & Yosemite from DVD but won’t allow any further updates; El Capitan, High Sierra, etc. SSD still MIA.
How do I wipe/reset Mac mini BIOS/EFI. Same re the HDD & SSD to exorcise demons preventing normal op? How about Terminal command drive utility that will return drives to original status? How does ‘bless’ work can I do it if I have command set & syntax?
Thanks much.
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