I am not familiar with this boot repair disk but they can be very basic and even fit on a floppy disk, or it might stop when it finds a previous grub installation, bit pointless if it is ment to repair?
You could run the original installation disk as live and do:
and see if it picks up on an installed version of GNU/linux, ie Lubuntu,etc
If it does then it should boot up ok.
If not try the live disk again and see just what is on the hard drive, also run a smartctl test on the hard drive to see if it is responding correctly, might be nackard.