@StephenJG
Check the browser to make sure the printing device (your printer) is selected and correct (not set to "fax" for example).
Browsers are very different - you could also try a different browser.
What else?
Aside from the obvious, that is, the printer software should be installed,
Consider:
Adobe Reader DC – Needed Whether You Use It or Not
If you have not done so,
Reinstall / Update your PDF Reader (Adobe Reader DC /Optional Foxit Reader)
HINT: Watch out for and UNCHECK unwanted extra software
NOTE: Adobe Reader DC software should be installed even if you do not normally open / view / print PDF files directly from the Adobe Reader DC software.
Printer Home Page - References and Resources – Learn about your Printer - Solve Problems
“Things that are your printer”
NOTE: Content depends on device type and Operating System
Categories: Alerts, Access to the Print and Scan Doctor (Windows), Warranty Check, HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, User Guides / Manuals, Product Information (Specifications), more
When the website support page opens, Select (as available) a Category > Topic > Subtopic
HP OfficeJet Pro 6970 All-in-One Printer series
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