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Grub:1. At boot, select the Linux distribution you want to boot into. When your selection is highlighted, hit the "e" key to edit the boot commands.2. Scroll down to the kernel command and type "e" to edit it. Go to the end of that line and type the word "single" (no quotes).3. Continue the boot. Instead of getting the GUI and X Window System windows manager, you'll get a simple little prompt that gives you full access to the system, including changing passwords.Lilo: just type "linux single" (without the quotes) at the LILO command prompt; you'll go into single-user mode.From here on you can login to ur root account which i think will probably work and here just change you're root password with : "passwd root" (without quotes).Change ur root pw. And reboot to ur GUI. Try using "init 5" or "kde" if this doesn't work just user "shutdown -r now" (all without quotes). Let it boot and see what happens. From my experience you should now be able to login again with root account and from the rootaccount change the normal user accounts.