If you do not have the software, you need to download the software fromthe following location:
HP Officejet J5780 All-in-One Printer
Chose 'software and drivers' link on page above.
Chose operative system and follow instructions to download the printer driver.
After downloading is finished, unplug the printer USB and run the
software that you downloaded.
The software installer will tell you when
to connect USB.
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