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Am I correct in thinking this would require the installation CD? If so I'm probably screwed. I'm using an old version of Mandrake and I have no idea which version it is. Can I boot into rescue mode with a new Mandrake CD?
When the computer boots up it goes into LILO. It doesn't give me any kind of option to include boot parameters. It lists "linux, linux-nofb, linux-secure, failsafe".
I have no idea why the account expired. Could be the fact that I manually changed the password file. The root password worked after I changed it. Once I logged out as root though I could only log back in as a normal user.
Ok, you have two options, either boot with a bootable CD (knoppix?) or a bootdisk (toms root boot), mount the partition in which / is stored, the chroot to the mountpoint and change root's password like that (passwd root). Or you can try to press TAB, ESC or something when Lilo's gui appears.
In LILO, when you are presented with the options (either in text-menu or graphical), press Esc and you'll get a command prompt. Type name of your usual kernel (e.g. linux-nofb), space and 'init=/bin/bash' and Enter.
Your kernel will boot as usually but you will get a root shell immediately (no services startup, no login prompts).