After replacing the toner cartridge the flashing! And the flashing 49 is showing

[M234sdw3]

I replaced my toner cartridge in my HP LaserJet printer. The model number is M234SDW. Now it’s showing an! And a flashing 49 and it will not print but sporadically

[VikramTheGreat]

Hi @M234sdw3,

Welcome to the HP Support Community.
 

Thank you for posting your query. I will be glad to help you.

 I understand how frustrating it is when your HP LaserJet MFP M234sdw shows a flashing 49 error after replacing the toner cartridge, especially when it prints sporadically and you're running Windows 8.1. The 49 error indicates an internal embedded software error.  

Let's walk through a few steps to resolve this issue. 

Step-by-Step Fix from HP Support

1. Power Cycle the Printer

This clears temporary memory and resets the system.

• Turn off the printer using the power button.
• Unplug it from the wall for at least 30 seconds.
• Plug it directly into a wall socket (not a surge protector).
• Turn it back on and wait for it to initialize.

2. Disconnect All Cables

• Turn off the printer again.
• Disconnect USB, Ethernet, or wireless connections.
• Restart the printer with no cables attached.
• If it boots to Ready, reconnect one cable at a time and test printing.

3. Update the Printer Firmware

Outdated firmware can cause 49 errors, especially after hardware changes like toner replacement.

👉 HP LaserJet MFP M234sdw Printer | HP® Support

• Download the latest firmware for your model.
• Install it using the HP Smart app or HP Easy Start.
• Restart the printer after the update.

4. Try a Different Print Driver

If the error occurs with specific files:

• Switch from Universal Print Driver (UPD) to PCL 6 or PCL 5.
• Save the file as a PDF before printing.
• Try printing from a different app (e.g., Word instead of Chrome).

5. Reinstall the Toner Cartridge

Sometimes the cartridge isn't seated properly:

• Open the cartridge access door.
• Remove and reinstall the toner cartridge.
• Make sure it clicks into place securely.

I hope this helps.

Take care and have an amazing day!
 

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Regards,

VikramTheGreat