I got it working with a little fooling--the problem seems to be with the Universal Binary on my new Intel iMac. I loaded the software on my Quicksilver (10.4.7) and it ran the printer perfectly. But there was no way it was going to work on the iMac. So, I uninstalled the software and then copied the installed software from the QS into the applications folder on the iMac. It works perfectly now--thus avoiding the HP installer altogether and, I assume, Universal Binary. A trick others might find useful. It is a great printer at an astounding price.