[ubuntu] Installing used hard drive

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http://ubuntuforums.org – Dell Inspiron 8600 I am trying to use a recycled hard drive that has a password protected Linux Centos Operating System for which I do not have the password I just want to reformat the drive and install Ubuntu 12.04 I have a good Live CD with 12.04 I can't seem to get to the setup screen and I can't get the machine to boot from the CD drive, but I can get to a GRUB> command line, which I am not familiar with Any suggestions will be appreciated Paul in Northeast Florida (Hardware)