You can enter single user mode directly after turning on the power to your system. The steps to do this are listed below.
1. Power on your system. Wait for the "Grub loading" message to appear and, depending on your Linux distribution, get ready to hit either any key or the ESC key to enter the grub boot menu.
Grub loading, please wait ... Press ESC to enter the menu
or
Grub loading, please wait ... Press any key to enter the menu
2. You will then get grub's main menu which will display a list of available kernels. Use the arrow keys to scroll to your desired version of the kernel and then press e for "edit".
Fedora Core (2.6.18-1.2239.fc5smp) Fedora Core (2.6.18-1.2200.fc5smp)
3. The kernel's boot menu will appear. Use the arrow keys to scroll to the "kernel" line and then press e for "edit".
root (hd0,0) kernel /vmlinuz-2.6.18-1.2239.fc5smp ro root=LABEL=/ initrd /initrd-2.6.18-1.2239.fc5smp.img
4. A grub edit prompt will appear. Use the arrow keys to move to the end of the line and add the word "single" to the end, separated by a space. Change
grub edit> kernel /vmlinuz-2.6.18-1.2239.fc5smp ro root=LABEL=/
to
grub edit> kernel /vmlinuz-2.6.18-1.2239.fc5smp ro root=LABEL=/ single
5. Press enter to save your changes, and then b for "boot".
6. The system will continue to boot, but will go straight to the root # prompt without first asking for a username and password and now we can reset any passwd.
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