tiger "install failed"

A friend of mine somehow ruined his iMac’s operating system (tiger) and tried to fresh format his hardrive. He told me that every time he would attempt to install, it would say “install failed” and he would have to restart.
I couldn’t imagine what he was doing wrong, so I attemped to install tiger on his iMac. OSX failed to install with “erase and install” so I ran disk utility and attempted repair with “failure to unmount”. I also tried erase via disk utility using various formating (journaled ect)

How would I be able to install tiger without error? Im not exactly sure why the installer fails, im assuming it is something on the hardrive that is preventing install. I don’t think it’s the disk because the installation disk check proceded and gave no errors.