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You should really go through the manual next time you buy a device, not only can it explain you all the features which it has, but you can also figure out answers to basic things like "how to reset it". Here's the manual, I hope I helped: HP Officejet J5780 PDF Manual
To get the scanner working this is what you should do. First, do not install the software for Officejet All-in-one J5780. Instead of this, install HP Officejet All-in-one J5700, you can get it from the HP website. I do not know why but this software makes the scanner work. You can then install J5780 which will delete some of the old files but will keep the scan file on.
You need to go to HP website to get free manual. Just type the HP officejet J5780 printer manual. Another way is to go through websearch, there are manual posted there for free download.
go here and select your operating system, then download whatever is needed
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=3301296&lc=en&cc=au&dlc=en&lang=en&cc=au&submit=Go%20»
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