Welcome to the HP Support Community.
I appreciate you trying all the steps. If you've performed all the steps from here: https://support.hp.com/us-en/product/hp-officejet-pro-6970-all-in-one-printer-series/8289585/model/11161264/document/c05076934, I recommend you to contact the HP Support Team regarding this as this could be a hardware issue.
Link: www.hp.com/contacthp/
Note: Select the country accordingly to get the contact details for support.
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