HP Deskjet 3420 Color Inkjet Printer - Manual (Page 76)

If the paper tray is empty, place the appropriate amount of paper into the tray.
USB problems
A printing conflict may arise when the printer and several USB devices are attached to
a hub. There are two methods for solving the conflict:
●
Attach the printer’s USB cable directly to the computer.
– or –
●
If the printer is attached to a hub, do not use other USB devices attached to the
hub while printing.
networking problems
The HP Deskjet 3300/3400 printers do not support networking.
out of paper
If the paper tray is loaded, push the paper forward until it stops.
76