CharPatton’s HP DeskJet F4280 All-In-One didn’t work with Snow Leopard until Joesph made a few suggestions. “HP Scan Pro no longer works and needs deleting.
Once that is done, then try Software Update and see if there are any new HP drivers.
There definitely are new drivers out..
Also make sure you delete all your printers from the Print/Fax preference pane.
Then ADD your printer.
This should work.”