macOS user account might not match the password of your login keychain.
If Keychain First Aid finds an issue that it can't repair, or if you don't know your keychain password, you might need to reset the keychain.
Mac stores certain settings in a special memory area even if it is turned off. On Intel-based Macs, this is stored in memory known as NVRAM; on PowerPC-based Macs, this is stored in memory known as PRAM.
The following key combinations are helpful for troubleshooting various Mac issues. For the best experience with startup keys, press the keys immediately after the startup tone plays.
Keychain Access is a macOS app that stores your passwords and account information and reduces the number of passwords you have to remember and manage.