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Brent wrote:

I recently bought a used late 2012 Mac mini. Somewhere in the process of setting it up my long time User account got corrupted. I don’t know where or when, and don’t care, other than I want to use the same User Name. Somewhere between the minimum OS and 10.15, Catalina, it got corrupted.. It might even when I Migrated from my MBP with 10.7.5. Who cares?

In 20 years of using Apple devices, this is the first time a User Account I am dealing with has corrupted on me. I can’t imagine how much detritus it has.

How can I fix it, or lose the least amount of good stuff?

OK
2012 Mini (with Intel CPU)
Catalina (macOS 10.15) installed
Boots successfully, but cannot log into primary account
DOES log into new, secondary account

Questions:
Hard disk drive or SSD (even the 2012 Mini had an SSD option)?
HFS+ or APSF format?
Is there a clone or Time Machine backup of a working version?

I am guessing that no appropriate backup exists, because you would already have tried that.

If it is a hard disk with HFS+ then I will say that Disk Warrior has pulled my ass out of the fire on more than one occasion in the past. (I have not had any incident where I *needed* it since going to SSD / APSF).

Alsoft says:
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DiskWarrior 5.3 is compatible with OS X 10.8 Mountain Lion through macOS 14 Sonoma?when rebuilding Mac OS Extended external drives.
DiskWarrior 5.3 now runs within macOS 10.14 Mojave through macOS 14 Sonoma Recovery on Intel Macs.