If your printer won't operate, start by checking the simplest things. Start by verifying that the power cable is plugged into the printer and a wall outlet, power strip, or surge protector. Next, make sure the printer's power button is turned on and that the printer's data cable is connected to both the printer and your PC.
Next, make sure there isn't a sheet of paper stuck in the printer. If there was a paper jam earlier, your printer may not even attempt to print any more documents until you remove the paper that's stuck.