[X4U] Leopard Password

[Paul Moortgat]

With SuperDuper I made a bootable copy of my internal HD (Tiger) to  
an external HD. (and also a backup to a second HD)
There I upgraded Leopard which all went very well.  I selected the  
upgrade method to keep everything as it was.  I've always done this.
After restart I'm asked to give my name and password in a small  
window.  Whatever name/password combination I give, nothing works.
Even Admin/admin will not work.  I assumed that all data was kept  
from Tiger.  How can I now login?
I know of a method:  start with a blank HD and re-install  
everything.  This is Vista progress.

Paul Moortgat