4) Plug the power cord back into the printer and wall, ensure the printer is plugged into the wall & not to a surge protector.
5) Insert the cartridges back into the printer.
Also, try cleaning the ink cartridges. Refer to solution# 3 to 5 from here.
If the issue still persists, please send us a private message with your Instant Ink account details or you may also respond to the private message I've sent out and I'll help you out, accordingly. Check next to your profile Name, you should see a little blue envelope, please click on it.
Hope this helps! Keep me posted.
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