My printer was working under 9.x. It is a an hp photosmart C3100 series. When I open the Admin-> printing. no local printers are found. I try to add via other (My local choices are Serial and other). I have tried many uri's - ipp://localhost:631/ipp, http://localhost/ipp, localhost, 127.0.0.1, etc... None have worked. Under the networked I have tried JetDirect, using localhost and 127.0.0.1 and port 631. I have tried many options under IPP with different variants in the host trying to verify a printer. No luck. I tried LPD/LPR with localhost and tried the probe. no luck. I tried the cups admin via localhost:631 and that didn't work. On the old version its simply found the local printer, I might have picked the driver, I can't remember but it was the photosmart c3100 series that was working. I just can't get 10.4 to print.