My HP4620 all in one won't print black ink, yet all diagnostics appear to be ok

[HelpmeinTexas]

I've tried all diagnostics but only color will print.  my black ink cartridge is recognized but all test pages print color only.

[sandytechy20]

@HelpmeinTexas

Welcome to HP support community.

Make sure that the cartridges are properly vented and seated correctly

1. Press the Power button to turn on the printer, if it is not already turned on. Wait until the printer is idle and silent before you continue.

2. Locate the two slots on the left and right sides of the printer.

   Figure : Locations of the two slots

   

3. Slide your fingers into the two slots, and then lift up to open the cartridge access door. The carriage moves into the access area.

   Figure : Open the cartridge access door

   

4. Press the tab on the front of the cartridge inward to release it, and then pull up on the cartridge to remove it from the slot.

   Figure : Remove the ink cartridge from its slot

   

5. Locate the vent area on the top of the cartridge.

   Figure : Vent area on the top of the cartridge

   

6. If the cartridge still has the orange pull-tab attached, pull to remove it.

   Figure : Orange pull tab

   

7. If the vent is clogged, use a straight pin to gently remove excess adhesive from the vent.

   Figure : Clean the clogged vent with a pin

8. 1. 

      Clogged vent

   2. With a straight pin, gently remove excess adhesive from the vent

   3. Unclogged vent

9. With the nozzle and contacts facing down, slide the cartridge into its slot. Press down on the cartridge until it clicks into place.

   NOTE: 

   Make sure that each cartridge is installed in the correct slot. Match the shape of the icon and the color of the cartridge with the slot that has the same shaped icon and color.

   Figure : Reinsert the cartridge

   

10. Repeat these steps to inspect the vents on each of the cartridges.

11. Make sure that each cartridge is firmly in place in its slot. Run your finger along the top of the cartridges to feel for any that are protruding, and if any are, press down firmly until each cartridge snaps into place.

12. Close the cartridge access door.

    Figure : Close the cartridge access door

    

13. Print, and then review another test page.

You can 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.

[HelpmeinTexas]

Already tried that, but it didn't work.  I ended up buying another printer, which was cheaper then purchasing more new ink cartridges and threw the printer out!

[sandytechy20]

@HelpmeinTexas

Feel free to contact us in the future if you need any assistance.

Cheers.