Hey, here comes a Linux nerd to the rescue. I'll provide you with a sure-fire step-by-step way of getting your brick operational again.
But, it involves the command line.
Grab your Mint Linux CD and put it in your drive. Boot from it. Log into it.
Now, do you know where you installed Mint? In Konqueror, under Storage Media, you should be able to find it. double-click the drive you installed Mint onto.
Now, press F4.
In the Konsole window that opens up, copy and paste this into it, line by line (in Konsole, Shift+Insert is paste):
Type a root password. You will not see anything on the screen as you type. This is normal, for security reasons.
Now, after that, keep typing exit until the Konsole window closes, and reboot into your installed Mint Linux. DON'T boot off of the CD.
Login as root, and immediately create a new user and log out as fast as possible. You don't want to use root for very long...
After you make your new user, open a Konsole window and type
to re-scramble the root password.[/code]