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HP Officejet Pro 8100 ePrinter - N811a/N811d

My OfficejetPro 8100 is showing a diagnostic light. The power light is on and the Cyan ink cartridge icon is blinking. The User Guide explains:

"One or more ink cartridges must be replaced to resume printing. Get new ink cartridges and replace the existing cartridges when prompted to do so."

I purchased a new ink cartridge and installed it, but the indicator light is still blinking.

Following the troubleshooting steps suggested in other posts on this site:

I have tried removing and re-inserting it multiple times. I have tried powering off the printer, waiting, then powering it back on.

I even went and purchased a SECOND new ink cartridge, suspecting the first one was defective. This did not fix the problem.

I tried removing the printhead carriage and cleaning the printhead. The problem remains.

I've run out of ideas. Does anyone have any suggestions for how to troubleshoot this problem?

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