My HP 126nw is stuck on "initializing." How can I access diagnostic information or error codes if the control panel is unresponsive?

When the control panel is completely unresponsive due to an "initializing error," accessing direct diagnostic information on the printer itself becomes very difficult. However, you might still have a few options: 1. **Embedded Web Server (EWS):** If the printer manages to briefly connect to the network before getting stuck, you might be able to access its EWS by typing its IP address into a web browser on a computer connected to the same network. The EWS often contains an error log, status reports, and diagnostic pages. 2. **HP Smart App:** If you've previously set up the printer with the HP Smart app (on PC or mobile), it might be able to pull some status information or error codes even if the printer is partially stuck. 3. **LED Indicator Patterns:** Consult your printer's user manual for a list of LED light patterns. Some printers communicate error codes or states through blinking sequences of status lights, even if the screen is unresponsive. 4. **Service Mode (Advanced):** Some printers have a hidden 'service mode' accessible via specific button combinations during startup, which might display internal error codes. This is typically for technicians and details are model-specific.