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Lu8411
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HP Recommended
OfficeJet Pro 8620

2 weeks ago I was alerted that I needed to replace my black ink cartridge.  I did.  Immediately after I did that, I started receiving error messages that printer head missing or failed printhead.  After reviewing help instructions on printer screen and temporarily removing print head, found accumulation of ink powder coming from cartridge.  Now after going thru self help on knowledge base for this issue, it is telling me that the print head needs replacing.  I am no longer under warranty.  I don't believe it is the printhead, I believe it has something to do with the replacement back in toner cartridge from instant ink.

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