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Printer not Printing black is a common issue which you tend to face from time to time. Unless there is some major hardware problem there is nothing to worry about. Here’s how to fix HP printer won’t print black. Try the common troubleshooting ways, make sure the connection is stable. Your HP printer must be set as default printer. Update the printer driver. The most common cause is that the printer is clogged with print head nozzles. Clean the print head and load some paper beforehand.