Problem with Install Disc on Mini

My mac mini went bad this morning, only displays a white screen with a ? folder. i believe it is a harddrive failure. Had Leopard installed on it.

Mac Mini
Core Duo 1.6 Ghz (superdrive model)
1 GB ram
100 GB harddrive

When i put in the OS X 10.5 install discs (mac os x installer version 1.0.3 (116.1), the start up screen comes up, but then says "you cannot install this software on this device". i was able to run the disk utility, but it could not finish, gave the message:

"Invalid Node structure"

Why won't the disk allow me to re-install Leapord? i tried using the 10.4.2 install disks, but nothing happened, just the ? folder icon. if i erase the hard drive will i be able to re-install leapord?

thanks.

 

10.4 or 10.5?

I am unfortunately at work with the machine but left my install discs at home.

the mini originally shipped with 10.4 install discs, but i have since upgraded to Leopard. Do i need to re-install 10.4 and then re-upgrade to 10.5?

thanks for the reply.

And can i go ahead and wipe the drive while i am at work (using the non-installable 10.5 discs) or do i need to wait until i have the usable 10.4 install discs?

 

thanks for the replies. i will try with my leopard disk when i get home.