The first thing you need to check is the Print Spooler service. It's the service that handles the communication between your computer and the devices. Go to Start > Run > services.msc. Locate it on the list then right click it and choose Restart. After this procedure, attempt to plot again. Secondly, go to Device Manager and check for driver's installation. If you see any yellow items, right click them, then choose Update Driver. Make sure you are connected to the Internet while doing this. The last step is to check if the devices are working good. Press POWER and keep the button pressed for 5-15 seconds to completely clear the memory.