SSD Not recognized as a bootable device
If you have a way to plug it into one of the macs (Sata to USB adapter), under the disk utility, you can hit auto repair
Sometimes boot sectors aren't configured correctly
Another shot would be to just reset BIOS to default, this fixes things way too often haha
Other than that, legacy boot or EFI boot settings
If that fails wipe and reinstall
Usually boot sectors are what causes an issue like this (Not mounting for bootup, being overwritten over time), happens a lot with bootable flash drives-A reformat fixes it, or running disk repair in EaseUS disk manager or OS X Disk Utility
Reading the error readout from Startup Repair prompted me to double check and make sure the partition was active (just for- whatever reason... because... technology...
) marked it as active, rebooted, and am not getting the BOOTMGR error, so that more-or less narrows it down to a boot sector, no? currently running startup repair. Unfortunately, I have no way of mounting it to either of my mac's, my external HD dock died on me several months back, haven't replaced it yet ![]()
Edit: That appears to have fixed it. God knows why... but it was marked inactive somehow (I mean... it was out of my system, on my desk when the Mechanical C drive was inserted... there's no logical reason for that to have happened)
Marked it as active, ran startup repair, fixed the bootmgr, and all is fine. ![]()

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