Reset Mac password without OS disc and without losing data :
Tutorial for Mac versions 10.6 or lower:
1. Boot into single user mode (press Command-S at power on)
2. Type fsck -fy
3. Type mount -uw /
4. Type launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist
5. Type dscl . -passwd /Users/username password, replacing username with the targeted user and password with the desired password.
6. Type exit
Tutorial for Mac versions 10.7 or later:
1. Boot into single user mode (press Command-S at power on)
2. Type fsck -fy
3. Type mount -uw /
4. launchctl load /System/Library/LaunchDaemons/com.apple.opendirectoryd.plist
5. Type dscl . -passwd /Users/username password, replacing username with the targeted user and password with the desired password.
6. Type exit
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