I have an HP PSC 1510 printer. I have the 1500/1600 PSC install disk. I start to install the software. It tells me there is no printer connected by USB. The computer - a very much upgraded G4 running 10.4.11 - sees the printer and says so in the about this mac information. The install disc is very specifically labeled for Mac. It is authentic HP, not a copy. The USB cable is brand new. I tried the install disc with an older G3 iMac, running 10.3.9. Same results. HP has pretty much made it so that if you don't have the software, you can't get the software, and definitely no help. What am I doing wrong? Or, do I need to pick up a different 1510? This printer works fine on USB with an HP desktop running Windows 10 latest version. Thanks for any help or questions.