HP ENVY Pro 6400 only printing black and magenta.

[BillHounslow]

Have tried new cartidge and head cleaning routine to no avail.

[MysteriousMe · Accepted solution]

@BillHounslow,

Welcome to HP Support Community.

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

1. Reseat All Connections

• Power off the printer and unplug it.
• Open the printer and carefully disconnect and reconnect the printhead ribbon cables and any visible connectors (sometimes, loose cables cause communication errors).

2. Check the Carriage Assembly

• Move the printhead carriage manually (when the printer is off) to see if it's obstructed.
• If it resists movement or feels rough, the carriage belt or motor could be failing.

3. Try a Different Firmware

• Check if a firmware update is available and attempt a manual reinstall (sometimes, firmware bugs cause hardware-like failures).

I hope this helps.

Take care and have a good day.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

Asfiya03

HP Support

[BillHounslow]

Thanks.  I feel almost too embarrassed to say that it's all fixed now.  When changing the colour cartridge, I stupidly put the old one back in and discarded the unused one.  Luckily I could retrieve it.

I must be getting old.

Thanks for your help.