My HP Scanjet 5100C is up and running on Windows ME. The USB printer in an HP Deskjet 960C. The scanner seems to work just fine in the Precision Scan mode; it is a parallel device. Using the HP Copy Utility is the problem. In the malfunctioning mode it acts like it is dumping the scan/copy to the printer, but nothing happens. There is no indication that it is queueing. Sometimes it works like a champ, copying anything, in color or otherwise, to the printer. As far as I know I am using the latest software and drivers from the Internet, HP and others. Any ideas?

hello look in device manager see if theres any problems.like shared irq,s.if somethings useing the same ones .it might be your intermitant problem.

I checked device manager and it does not show any danger signals. However, Under 'scanners and cameras' it references HP Scanjet 5100C #2. Could that be it? That is, did I install something twice? I don't know how to correct it, but the second sentence in my original message should have read "The USB printer is an HP Deskjet 960C" rather than "in an".