Hi @JosephRutkowski,
Welcome to HP Support Community.
Thank you for posting your query, I will be glad to help you.
I'm sorry to hear you're experiencing critical system errors on your HP OfficeJet Pro 9120e, specifically error codes C7.02.11.0B and C3.D9.F4.0B, which are preventing you from printing or resetting the printer. While these specific error codes aren't widely documented, the following general troubleshooting steps may help resolve the issue.
Update Printer Firmware: Outdated firmware can lead to various errors. Ensure your printer's firmware is current:
- On the printer's control panel, navigate to Settings> Printer Maintenance> Update the Printer.
- Alternatively, use the HP Smart app or visit the HP support website to download and install the latest firmware.
Check Ink Cartridges: HP printers may encounter issues if non-HP or refilled cartridges are used. Ensure you're using genuine HP cartridges. If you're using third-party cartridges, consider replacing them with official HP ones to see if the error persists.
Reset the Printer: Performing a reset can clear temporary glitches:
- With the printer powered on, disconnect the power cord from the back.
- Unplug the power cord from the wall outlet.
- Wait 60 seconds.
- Plug the power cord back into the wall outlet and then reconnect it to the printer.
- Turn the printer on.
Check Network Connection: Ensure the printer is properly connected to your network:
- Verify that the Ethernet or Wi-Fi connection is stable.
- Restart your router and printer to refresh the connection.
- Ensure the printer and your computer are on the same network.
Reinstall Printer Software: Corrupted drivers or software can cause errors:
- Uninstall the current printer software from your computer.
- Download the latest drivers and software from the HP support website.
- Install the software and follow the setup instructions.
I hope this helps.
Take care and have a good day.
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Max3Aj
HP Support