Hi @stmlandplan
Welcome to the HP Support Community!
Thanks for posting your query! We're here to help you get back up and running.
I understand how frustrating this situation can be, especially when your printer was working fine before the error appeared. The "Problem with Supply System" message on your HP OfficeJet Pro 7740 often indicates a cartridge recognition issue, firmware conflict, or a sensor malfunction.
Here’s a structured approach to troubleshooting:
Check Cartridge Compatibility
- Ensure you are using genuine HP cartridges.
- If using third-party ink, HP’s firmware may be restricting their use.
- You can check HP’s guidance on non-HP ink compatibility here.
Remove and Reinstall Cartridges
- Take out all cartridges, turn off the printer, and unplug it for 60 seconds.
- Reinstall the cartridges one by one, ensuring they are properly seated.
Perform a Hard Reset
- Turn off the printer and unplug it.
- Hold the power button for 30 seconds to drain residual power.
- Plug it back in and turn it on.
Clean Cartridge Contacts
- Remove the cartridges and gently clean the gold contacts with a lint-free cloth.
- Also clean the printhead contacts inside the printer.
Update Printer Firmware
- HP regularly releases firmware updates that may resolve cartridge recognition issues.
- Follow this link for instructions on updating your printer firmware.
Run HP Print and Scan Doctor (For Windows Users)
- Download and run HP Print and Scan Doctor to diagnose cartridge-related problems.
- Get it here.
Check Ink Levels in HP Smart App
- Open HP Smart and check if the ink levels match what the printer is displaying.
- If the levels seem incorrect, a sensor calibration issue may be causing the error.
Perform a Factory Reset (Last Resort)
- On the printer’s display, go to Setup> Printer Maintenance> Restore Defaults.
- Select Restore Factory Defaults to erase previous settings.
Let me know if you need further assistance! I hope this helps get your printer back to normal.
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Take care, and have an amazing day!
Regards,
Hawks_Eye