Hey There, I am Sofia Carter. Blinking lights on HP printers is one of the most prevalent problems that consumers have encountered. The ‘HP printer all lights flashing’ indicate that your HP printer is reacting to the commands issued by the user. The blinking and status of the printer's light are totally dependent on how well your printer is operating. Different lights and their activities signal different things, but flickering lights unquestionably suggest that something is amiss.