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In order to do HP printer troubleshooting, you need to make sure that the connector cables are properly connected to the printer power source. Then you should also see if the USB cable is in place from both the ends.If you have used a network cable running to the HP printer for network printing then check if Ethernet cable is in place. Check if the light is blinking or not as it indicates a network connection. The lights should be turned on and if they are not then you should unplug it and unplug it. These basic HP printer troubleshooting methods will be able to help you out when you face some basic errors.