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If your HP printer is not working properly, then the very basic thing that you need to do is to clean the ventilators properly. There are a number of openings and ducts through which dust enters into the system, which directly affects the working of the machine. So, if you think that the printer machine is not working swiftly like before, then follow this process and then restart it again plugging into the switch board. Still, if you see that the problem has not been cleared properly, then you should go ahead and contact the experts of HP printer immediately. It is better to not to delay as otherwise it is possible that the machine degrades further.