does the printer even have wireless capabilities? My older ones always needed the cable. Maybe you need to read the manual, you can find it on-line on HP's site, if you don't have it, although it is 840 c, I can 't find 840 2c anywhere.
you use USB port for connect you HP Printer with you Laptop or PC .
if you are using wireless Printer then you first set controls with control panel .
and use your HP Printer but i believe you use Manual Connection because it's best .
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