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I see from the post that you are having issues with scanning stopped working on your HP OfficeJet printer. Don't worry as I have a few steps to help you get through this concern,
To provide you with an accurate solution, I'll need a few more details:
Does that Scanner bulb light up?
Does the scanner bar move when you open the lid & press the copy button?
Have you checked if the unit can make a standalone copy? If ‘YES’ then it means the scan hardware of the All-in-One works fine.
From your post, I understand that your operating system is MAC Sierra which is 10.12. I checked the HP driver page and the 10.12 drivers are not yet available.
Let’s first try to “Enable the scan to computer” option. Go to “Applications”, click the “Hewlett-Packard” or “HP” folder, then double-click “HP Utility”. Under “Scan Settings”, click “Scan to Computer”, then make sure the “Enable Scan to Computer” check box is selected. Now try to scan and check.
If the above step does not fix the issue, then try to reinstall the printer using the built-in print and scan drivers. Please follow the below-mentioned steps and check:
- Click the Apple menu icon, and then click System Preferences.
- Click Printers and Scanners, Print and Scan, or Print and Fax.
- Right-click the blank space in the Printers list, and then click Reset printing system.
- Click Reset in the confirmation window.
- Enter an administrator username and password, and then click OK.
- Wait until the printing system is reset and no devices show in the Printers list
- Click the Add button (+)
- Find, and then select the name of your printer from the Printer list, and then click Add to add your printer.
- Click Print Using..., and then select the name of your printer (By default “Airprint” would be selected)
Also, please go through some additional steps mentioned here: http://hp.care/2c8d3fR
HP Printers - Scan from Printer Fails or Cannot Enable Scanner (macOS Sierra)
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Good Luck.