Mac says password is wrong, but is right, and wants me to enter it again to start Mac every time. My password is used to be characters and numbers. I changed my password into all numbers but it doesn't work.
How could I solve it?
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If you are talking about the user password and you are locked out of your mac, you can try the following:
Keep in mind that this deletes your keychain, so your saved passwords are lost
I have the same issue. I found out when I watch what's happening carefully, as I type my password the first time the Mac resets and clears the text area (shortens the line of asterisks) and I have to enter it again - making sure it's not a partial entry. Seems something is still waking up in the background. Type slowly and observe if the line of '***' becomes suddenly shorter. Frustrating.
Other causes have to do with unlocking FileVault if you have that set up. Found on discussions.apple.com.