on the HP site- I found this page-
http://h10010.www1.hp.com/wwpc/us/en...51-445475.html


[Recommended Printer Cables and Cable Kits

HP Printer Cables HP Deskjet 3940 Color Inkjet Printer


HP USB Cable (a-b) 2 meter (C6518A) ]

I think these types of cables are pretty generic , meaning one brand will work with another brands product.
the older style printer cables were interchangeable too.

I leave both types connected to my computer and then hook up the one needed.