: A defective formatter board or improperly seated memory chips. Steps to Resolve the Error To troubleshoot this issue, follow these steps in order: Perform a Cold Reset : Turn off the printer using the power button.
Have you checked the in the Embedded Web Server to see if there are any other related error codes? MFP Printer Code Errors Unknown - HP Support Community
Keep holding until the message or "Cold Reset" appears on the screen.
d4 — Resource exhaustion