[Cube] Leopard Install

[Riba]

Folks,

So I decided to go ahead and install Leopard on stock 450 MHz Cube.  
As it would refuse to install directly, I wanted to install it using  
my Powerbook and mounting the Cube in target disk mode. However, it  
refuses to mount on a Powerbook in target disk mode no matter what I  
try. Tried changing the cable and ports, but no luck. It once  
appeared in Disk utility, but I could not mount it.
Any ideas?