hp laserjet pro m234dwe won't print at all, just says 'processing job' forever

Diagnosis

This "Processing" hang on the HP LaserJet Pro MFP M234dwe is typically caused by a corrupted print spooler handshake or a DNS mismatch between the printer and the router. When the computer sends a job, it creates a temporary spool file; if the printer fails to acknowledge the receipt of the data packet—often due to a stale IP address or a "WSD" (Web Services for Devices) port conflict—the software remains in a loop waiting for a confirmation signal that never arrives. You can confirm this is a communication hang rather than a hardware failure by checking the printer's control panel. If the screen shows "Ready" but the computer says "Processing," the issue is the data pipeline. If the printer screen is blank or showing an error code like "E3" or "E4," you are dealing with a physical jam or cartridge error that is blocking the queue. In most cases with the M234dwe, the culprit is the HP Smart app's reliance on a dynamic IP that has shifted, leaving the print driver shouting into a void.

How to Fix It

To clear the communication deadlock and re-establish a stable link, follow these precise steps:

1. Purge the Local Spooler: On your Windows PC, press the Windows Key + R, type services.msc, and hit Enter. Scroll down to "Print Spooler," right-click it, and select "Stop." Now, navigate to C:\Windows\System32\spool\PRINTERS and delete every file in that folder. Go back to the Services window, right-click "Print Spooler," and select "Start."
2. Hard Reset the Printer: While the printer is powered on, pull the power cord directly from the back of the machine. Wait exactly 60 seconds to allow the internal capacitors to discharge. Plug it back in and wait for the "Ready" status on the LCD.
3. Reset Network Defaults: Press and hold the Information (i) button for 5 seconds until the control panel lights up. Immediately press and hold the Wireless and Cancel (X) buttons simultaneously for 5 seconds. The printer will restart and the wireless light will blink, indicating it is in setup mode.
4. Re-provision via HP Smart: Open the HP Smart app on your mobile device or PC. Remove the existing M234dwe instance by right-clicking the printer icon and selecting "Hide" or "Remove." Click "Add Printer" and follow the prompts to reconnect the machine to your 2.4GHz Wi-Fi band.
5. Assign a Static IP (Pro Tip): Once connected, type the printer's IP address into a web browser to open the Embedded Web Server (EWS). Go to the "Network" tab, select "IPv4 Configuration," change from "Automatic/DHCP" to "Manual/Static," and save the settings. This prevents the "Processing" loop from returning when the router reboots.

If That Didn't Work

• Switch from WSD to Standard TCP/IP Port: Go to Control Panel > Devices and Printers. Right-click your M234dwe and select "Printer Properties." Go to the "Ports" tab. If "WSD" is checked, click "Add Port," select "Standard TCP/IP Port," and enter the printer's current IP address. This bypasses the unstable HP discovery protocol.
• Disable "HP+" Cloud Requirements: If you are using the "e" version (M234dwe), the printer requires a constant connection to HP servers for Instant Ink. If your firewall is blocking port 443 or 80, the printer will hang on "Processing" while trying to verify your subscription. Temporarily disable your third-party antivirus/firewall to test connectivity.
• Test via USB Cable: Connect a USB-B to USB-A cable from the printer to your PC. If it prints immediately, the issue is 100% network-related. If it still says "Processing," the issue is a corrupted driver installation; uninstall all HP software and download the "Full Feature Software and Driver" package rather than relying on the basic Windows Class driver.
• Check for Firmware Deadlocks: Access the EWS (Embedded Web Server) via the IP address and check for a firmware update. Some early versions of the M234dwe firmware had a known bug where large PDF files would cause the memory buffer to overflow, resulting in an infinite "Processing" state.

Heads Up

• Avoid 5GHz Bands: The M234dwe often struggles with "Smart Connect" routers that merge 2.4GHz and 5GHz bands. If you experience frequent disconnects, create a separate 2.4GHz Guest Network specifically for the printer.
• Avoid "Print to PDF" Loops: Ensure you aren't accidentally sending the job to "Microsoft Print to PDF" instead of the physical HP LaserJet Pro; this is a common mistake that looks like a processing hang.
• Toner Chip Errors: If using third-party non-HP cartridges, the "Processing" hang can actually be a hidden "Cartridge Policy" block. Ensure "Cartridge Policy" is disabled in the EWS settings to avoid software-level print blocks.
• Paper Tray Alignment: Ensure the paper guides in Tray 2 are snug against the paper. If the printer senses a slight misalignment, it may pause the job in "Processing" while waiting for a manual tray adjustment that isn't being signaled to the PC.