Can someone help with my hard drive / leopard / backing up issue?

Here goes......

My hard drive (recently backed up with Time Machine) failed the other day. I just installed a new one and used the original install discs (Tiger.)

I can boot the computer to the Tiger OS. I had family pack of Leopard (5 uses.) I put the disc in and follow the directions to restart the computer.

The computer never fully restarts, so Leopard never runs. I have a fully backed up external hard drive, but I need to restore it with Time Machine (I think.) Meaning, I can't boot it with it.

What's your best idea to deal with this issue?

Sounds like the family Leopard OS discs have failed so give Apple a ring quoting when and where purchased and your problem. Have you tried wiping the disc in case it is dirty?