Unfortunately, this was not the end of the story for me. After following the above steps, the name of my printer did not appear in the Print Using line. Instead, it said Generic PostScript Printer. I went with this choice, hoping that it would work, but had no success. The printer was added but I still could not print to it. I tried again with other possible Print Using choices, as obtained via the Select Printer Software option in the pulldown menu. Nothing worked.

Contacting HP for help was useless. The company told me that it no longer offered support for the 4000N. An . Another Apple article provided . But neither article pointed the way to a solution.

Undeterred, I searched the Web and eventually found an HP Web page that described the procedure for : Turn the printer on while holding down the Go button. (If you try this, don't remove the printer's JetDirect card, despite what the Web page says.) The reset forced the printer to update its IP address, to one that now matched my current local network. I entered this new address in the Add Printer window. Success! I am once again able to print to my still trusty LaserJet.

I also have a Canon inkjet printer, connected to my Mac via the USB port on my AirPort Extreme. Prior to Snow Leopard, I could not directly access the printer's options to check its ink levels--as Leopard did not permit accessing this feature from an AirPort-connected printer. To do so, I had to temporarily connect the printer to a USB port on my Mac (or use the information available from the LCD screen of the printer).