my hp laserjet pro m234dwe won't connect to wifi, keeps blinking

Diagnosis

When the wireless LED on the HP LaserJet Pro MFP M234dwe blinks continuously, it indicates that the printer is in a "Searching" or "Setup Mode" state. This means the hardware is powered on and the wireless radio is active, but it has failed to establish a handshake with your router's SSID. This is frequently caused by a "stale" network configuration where the printer is attempting to connect to a previous network profile or a corrupted DHCP lease that prevents it from receiving a valid IP address. Another common culprit for this specific model is the 2.4GHz vs 5GHz frequency conflict. The M234dwe is designed to operate primarily on 2.4GHz bands. If your router uses "Smart Steering" (combining both bands into one name), the printer may attempt to authenticate on the 5GHz band, fail, and then enter a blinking loop. You can confirm this by printing a Network Configuration Page; if the IP address is listed as 0.0.0.0 or 169.254.x.x, the printer is not communicating with the gateway.

How to Fix It

To resolve the blinking light and force a clean reconnection, you must perform a network factory reset and re-initialize the setup mode. Follow these exact steps:

1. Power on the printer and ensure it is within 5 feet of the router for the initial pairing process to avoid signal attenuation.
2. Press and hold the Information (i) button for exactly 3 seconds. Release it once all the control panel buttons illuminate.
3. Simultaneously press and hold the Wireless button and the Cancel (X) button. Keep both held for approximately 5-10 seconds.
4. Release both buttons. The printer will initiate a soft reboot. Wait for the Status light to pulse purple or the Wireless button to blink blue. This confirms the printer is now in "Setup Mode."
5. Open the HP Smart app on your mobile device or PC. Ensure your device is connected to the 2.4GHz band of your Wi-Fi.
6. Select "Add Printer" or the "+" icon. The app will scan for the M234dwe in setup mode.
7. Follow the on-screen prompts to enter your Wi-Fi password. Once the blue wireless light turns solid, the connection is established.

If That Didn't Work

• Disable 5GHz Band Steering: Access your router's admin panel (usually via 192.168.1.1 or 192.168.0.1). Temporarily disable "Smart Steering" or "Band Steering" and create two separate SSIDs (e.g., "Home_Wifi_2.4" and "Home_Wifi_5"). Connect the printer specifically to the 2.4GHz network.
• Perform a Hard Power Cycle: Unplug the power cord from the back of the printer and the wall outlet. Turn off your router for 30 seconds. Plug the router back in first and wait for the internet to be fully active, then plug the printer back in. This clears the ARP cache in the router.
• Use WPS Push Button: If the app fails, press the WPS button on your router for 3 seconds. Within two minutes, press and hold the Wireless button on the printer for 3 seconds. The light will blink rapidly and then turn solid once the handshake is complete.
• Assign a Static IP: If the printer connects but then starts blinking again after a few hours, it is a DHCP conflict. Use the HP Smart app to access "Advanced Settings" (the Embedded Web Server), navigate to the Network tab, and change the IP assignment from "Automatic" to "Manual," assigning an IP outside your router's typical DHCP range (e.g., .200 to .250).

Heads Up

• HP+ Requirement: If your model ends in "e" (like the M234dwe), it requires a constant internet connection to function. If the Wi-Fi drops, the printer may lock you out of printing until the connection is restored.
• Avoid Guest Networks: Never connect the printer to a "Guest" Wi-Fi network, as these typically have "Client Isolation" enabled, which prevents your computer from seeing the printer even if the printer is connected to the web.
• Firmware Updates: Once connected, immediately check for firmware updates in the HP Smart app. Wireless stability issues on the M234 series are frequently patched via these updates.
• Signal Interference: Keep the printer away from microwave ovens and cordless phone bases, as these operate on the same 2.4GHz frequency and can cause the wireless light to start blinking intermittently.