@daswede, Welcome to the HP Support Community!
Thanks for reaching out about your query regarding missing or failed printhead error!
We're thrilled to have the opportunity to assist you and provide a solution.
It sounds like you've already tried some good steps in troubleshooting the issue with your HP OfficeJet Pro 8715. Let's go over a few more options to help you resolve the "missing or failed printhead" error:
1. Check for Firmware Updates:
Sometimes, issues like these can be resolved by updating the printer’s firmware. HP may have released updates that improve compatibility or fix known bugs.
- Go to the HP support website and search for your printer model or click here to download the latest firmware update.
- Check if there’s a newer firmware version available and follow the instructions to update it.
2. Check the Printhead Connections:
Ensure that the printhead is properly seated and making a good connection with the printer. Even though the printhead is new, sometimes there can be an issue with alignment or connection.
- Turn off the printer and unplug it.
- Open the printhead access area and remove the printhead.
- Gently clean the electrical contacts on both the printhead and inside the printer with a soft, lint-free cloth.
- Reinstall the printhead and check if the error persists.
3. Perform a Clean Printhead Procedure:
HP printers have a built-in cleaning cycle for the printhead, which can help resolve issues with printhead functionality.
- On your printer’s control panel, go to Settings > Printer Maintenance > Clean Printhead.
- Follow the on-screen instructions to clean the printhead.
4. Check the Cartridges:
Since you've replaced the cartridges, it's worth verifying if the new ones are fully functional or if there's a defect.
- Try using a different brand or batch of cartridges.
- Ensure that the cartridges are seated correctly in their respective slots.