I just installed Ubuntu 12.04 PP on one of the three hard drives I have in my PC. I chose / as the mount and made the whole 1gb partition ext4. When I choose to boot the hard drive in BIOS, it just boots my other hard drive that has Windows 7 on it. I know I installed it because I've installed Ubuntu from the same DVD, and it said the installation was complete.
What can I do to get Ubuntu to boot?