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Console Hack MacOS X 10.6 – Snow Leopard

Command-S on boot to get into single user mode

# All commands in Unix are CASE Sensitive

# Run a disk check to make sure the filesystem is in a good state
fsck -fy

# mount the root filesystem read/write as it’s readonly at this point
mount -uw /

# Start Apple Directory Services – as they don’t use normal Unix password files
launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist

# Reset your password to CoolPassword … or what ever your usual password is (keep it the same as your previous one so your KeyChain continues to work)
dscl . -passwd /Users/Daniel CoolPassword

# Flush disks to make sure changes are written
sync
sync
sync

# reboot
reboot

You can also try Apple’s solution to Mac OS X 10.5: Unable to log in after an upgrade install

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