I have a 17" Macbook Pro which I upgraded to Mavericks about six months or a year ago. Yesterday, the disk crashed and so I reinstalled from the original install DVD (thus reverting to Snow Leopard), and then had it restore all my data from a Time Machine backup.
Now it won't let me log in on any account, even though I'm sure I got the password right.
(I had intended to upgrade to Mavericks again, but now I can't because I can't log in.)
I booted to recovery mode and ran the
resetpassword command and changed my passwords. But when I rebooted, the system still wouldn't recognize them.
I booted single user, removed /var/db/.AppleSetupDone, rebooted, went through the "first use" wizard, created a new admin account, and used that admin account to set my other accounts' passwords. The system still wouldn't recognize them.
I'm guessing that the Time Machine backups have passwords stored in some format or encryption that Snow Leopard does not understand, and for some reason this is preventing Leopard from actually changing the passwords.
What do I do now? Does anybody recognize these symptoms?
(Edited for clarity.)