Try using “dmesg | less” (without the quotes) and look for the USB connection and also hp-probe.
At this point you may have to contact the HP printing tech. support. They are very familiar with their software.
I have included more commands that you can use.
**
Using command line tools**
HPLIP includes many command line tools. Most of these features are available from the hp-toolbox. However you can run the commands separately or at the command line with many different variables and options.
If you run the command with -h you will get help on using the application.
hp-align - performs the align cartridges function (certain printers only)
**hp-check **- checks the system for the current status of HPLIP
hp-clean - performs the clean cartridges function. (certain printers only)
hp-colorcal - perform the color cartridge function. (certain printers only)
hp-fab - opens the fax address book
hp-firmware - downloads the firmware to the printer (if supported)
hp-info - display printer information and status
hp-levels - displays the current ink cartridge level
hp-makecopies - starts the make copies application (certain printers only)
hp-makeuri - creates device URI’s for use with cups
hp-print - starts the hplip print application
hp-probe - discovers attached usb, parallel, and network printers
hp-scan - starts the hplip scan utility (interactive only no GUI)
**hp-sendfax **- starts the send fax application (certain printers only)
hp-setup - used to configure and install a printer or another printer queue
**hp-systray **- starts the hplip systray tool, this is started automatically when hp-toolbox is run
hp-testpage - sends a test page to the printer
hp-timedate - sets the time and date on the printer (certain printers only)
hp-toolbox - starts the hp device manager application used to access most of the hplip tools
**hp-unload **- used to access the printer photo cards, not all printers are supported (certain printers only)