office jet pro 8720 shows Supply System Problem

[shinnder]

office jet pro 8720 shows Supply System Problem, indicate the black ink cartridge but it was half full when the problem occurs
i then buy a new cartridge and install, still same problem.
i have tried all the possible solutions from the HP diagnose sites, but none of it help.

kindly advice! 

[sandytechy20]

@shinnder

Welcome to the HP support community.

Clean the cartridge contacts

1. Turn the printer on.

2. Open the door to access to the cartridges.

3. Wait until the carriage stops moving before you continue.

4. Push in on the front of the cartridge indicated in the error message, and then remove it.

   

5. Wipe the electrical contact on the cartridge with a lint-free cloth.

   

6. Insert the cartridge into its color-coded slot until it snaps into place.

   

7. Repeat these steps for any other cartridges indicated in the error message.

8. Close the cartridge access door.

Refer this HP document for more assistance:- Click here

I hope that helps.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.