I have a HP Office Jet Pro 7740. It stopped accepting new Magenta and yellow cartridges

[Drklemm]

My HP Officejet Pro comes up telling me that I have a Supply System Problem.  It tells me to change my yellow and Magenta cartridges.  I have done so with 3 separate sets of new cartridges and it's always the same. I cleaned the back contacts and the cartridges contacts but nothing works. Help

[Elohi_NR]

Hi @Drklemm ,

Welcome to the HP Support Community. 

I'd be glad to help you! 

Perform the following tasks in the order given. Use the printer after each task to see if the issue is resolved.

Clean the printhead

• Use an automated tool to clean the printhead to restore print quality.
• Load plain white paper into the tray.
• On the printer control panel, swipe down on the touchscreen to open the Dashboard.
• Touch the Setup icon .
• Touch Printer Maintenance, and then touch Clean Printhead.

Check for issues with the ink cartridges

• Very low ink levels and using non-HP cartridges can cause print quality issues.
• Replace any non-HP or refilled cartridges with genuine HP cartridges. HP supplies are available from the HP Store and local retailers.
• HP cannot guarantee the quality or reliability of non-HP or refilled cartridges. Go to HP Anti Counterfeiting and Fraud Program for more information.
• On the printer control panel, swipe down on the touchscreen to open the Dashboard, and then touch the Ink Level Indicator icon .
• Check the ink levels and replace any low or empty cartridges.

• Rough handling of cartridges during transport or installation can cause print quality problems. Wait a few hours for the automatic servicing routine to complete, and then try to print again.
• If you have a defective HP cartridge, it might be under warranty. Go to About Original HP Cartridges for page yield and HP Limited Warranty information.

Click here for the remaining steps.

Update the firmware. Click here

You may also refer to this document for cartridge errors. 

Hope this helps! Keep me posted for further assistance

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