install 10.5 on mac mini 1.42 Ghz, nothing works!

Hi,

I want to install leopard 10.5.x on my Mac Mini 1.42 Ghz, on which I have Tiger 10.4.11, but nothing will work. My problem is that mij superdrive is defect and under Disk Utilities it issn't possible to resize my harddisk. I do have a bootable version of Leopard 10.5 but I can't get it installed on my Mac Mini.

I have tried:

1) Resizing my hard disk but somehow I cannot resize it, because it contains the startvolume. I wanted to make an extra partition on which I could write Leopard, but this doesn't work. I also tried to rezise it with iPartition but it gave the same message.

2) Using my Mac Book Pro in Target Disc mode and play the DVD in it's superdrive. I can start the DVD on my Mac Mini but when it restarts it doesn't start installing and returns in its normal mode.

3) Using my FireWire Disc on which I have installed Leopard 10.5 (with SuperDuper). Starting up my Mac Mini I held down the Alt-key but my FireWire disc doesn't appear in the list of possible bootable harddrives.

4) I have used an usb disk drive, but it doesn't continue after restarting my Mac Mini during istallation.

5) we want to remove the harddrive and connect it directly to my MB Pro. Maybe this way we can rezise the partition? Does anybody know?

I am out of ideas.

What is the sollution to this problem??? Who has any other ideas?

I hope to hear from you

Kind Regards

Bob