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WHY ALL OF THE SUDDEN IS MY hp F4180 ink 21 printing green
@DONBETC, Welcome to the HP Support Community!
Check the ink levels and replace any low/empty ink cartridge.
Print a self-test page
Load the input tray with unused plain white paper.
Press and hold the Cancel () button and then press the Start Copy Color () button.
Release both buttons. The self-test page prints.
Look for defects
Clean the ink cartridges as shown in this document. Now, try printing.
Hope this helps! Keep me posted.
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KUMAR0307 I am an HP Employee
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