How do I unlock the ink valve before printing on the HP DeskJet GT 5810?
Before printing, make sure the ink valve is unlocked by turning the valve left to the vertical position. The ink valve is located on the front of the ink tank and controls the flow of ink to the printer. You must ensure the valve is unlocked for printing and locked when moving the printer.
From the official HP Deskjet GT 5810 All-in-One Printer manual, page 10
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