To reset your “root” password in Fedora 15:
- Restart your Fedora 15, from grub menu select Fedora 15, then press “e“. Use arrow key to select second line (start with “kernel … “) and then press “e” to edit
- Add “single” at the end of line and press “ENTER” to go back.
- After back to previous grub screen (see first picture), press “b” to boot into Fedora 15. Now Fedora 15 will read option “single” this parameter will boot Fedora 15 to single mode and drop us to shell with root account. Wait until boot process finish and show shell prompt.
- From single mode shell, type “passwd” and input your new password for “root”
Reboot Fedora 15 with new root password, from shell enter “reboot” command. Now you can use new root password for Fedora 15.