My iMac gets its login screen, but won’t accept my password

If you have a wireless keyboard that is not connecting or working, then you need to get and use a USB keyboard.

Spurs456 Said:

"My iMac gets its login screen, but won’t accept my password How do I get it to start"

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Two Thoughts:

A. Reset the SMC and your NVRAM:

Sometimes when changes are made to the system(i.e. updates), system configurations (i.e. for keyboard) become manipulated, technically. So, reset the SMC and NVRAM.

and...

B. Try Safe Mode:

[Hold Down command key + R key] simultaneously upon boot. In Safe Mode, corrupted system setting files (caches), are intentionally fixed.

1. Boot: in Safe Mode
2. Log In: as Same User
3. Wait: 30 seconds
4. Shut Down: the Mac
5. Wait: 30 seconds
6. Boot: the Mac normally
7. Log In: as Same User
8. See if can get this to work