HP 7720 Print head is missing, not detected or incorrectly installed

[JaneK22]

The error message is that the Print Head is missing, not detected or incorrectness installed.  I have not had a paper jam or moved it, I don’t know how to get to the print head and the HP website is being worked on so is a complete nightmare!  Please help!  Thanks 

[Echo_Lake]

@JaneK22

Thank you for posting on HP Support Community.

Don't worry as I'll be glad to help, I have a few troubleshooting steps we could try to fix the issue:  

• (1) Turn the printer on, if it is not already on.
• (2) Wait until the printer is idle and silent before you continue.
• (3) With the printer turned on, disconnect the power cord from the rear of the printer.
• (4) Unplug the power cord from the wall outlet.
• (5) Wait at least 60 seconds.
• (6) Plug the power cord back into the wall outlet.
•  NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
• (7) Reconnect the power cord to the rear of the printer.
• (8) Turn on the printer, if it does not automatically turn on.
• The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
• Wait until the warm-up period finishes and your printer is idle and silent before you proceed

Then update the Firmware from this Link: https://support.hp.com/in-en/drivers/selfservice/hp-officejet-pro-7720-wide-format-all-in-one-printe...

If the issue persists follow the instructions in Steps 3 - 7 in this Link: https://support.hp.com/us-en/product/hp-officejet-pro-8610-e-all-in-one-printer-series/5367603/model...

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.