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HP Smart Tank won't print due to "Printheads Missing" error. I believe only the black printhead has a problem. When I open up the printer, I can see the tubes that carry to color ink to the color printhead are full. The tube, taking the black ink to the printhead, is full as it leaves the black reservoir but runs out before it reaches the black printhead, in other words black ink is not making it to the printhead. The level of black ink is low but I have not received a message indicating that it's time to refill the black ink. I estimate there is probably 20% of black ink remaining in the reservoir. 

So far I have tried:

restarting the printer

reseating the printheads

Looking forward to any ideas you have for resolving this issue. 

Thank you!

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