Looking at the whole thread above, it looks like the hplip diagnostic tools aren't being used. 1) Run hp-probe. Does it find the printer? If not, this is a networking issue. Eter the printer's IP address in a browser window. If the printer can be found this way, the router is blocking ports that need to be open for printer discovery. 2) Run 'hp-check -r'. This will run a diagnostic that will check for software issues.