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Boot machine into GRUB loader.
Highlight kernel you want to boot into.
Press (e) to edit boot process.
Add a space and then press (s) at the end of the boot sequence command line (this is for single user mode).
Press (b) to reboot machine.
Machine loads into root without a password.
Use passwd to create a new password.
Then issue 'shutdown -r now' to reboot machine.