To find out the answer to the questions like how do you get a printer back online on a Mac, you are supposed to follow and apply few important instructions that are explained here. Now, first of all, you should turn the Mac off and then back on, then you should power cycle the printer, make sure printer is connected to the network or computer, now you must set it as the default and then you should delete any open print jobs. Now, you must uninstall and reinstall the printer and then reset the Mac’s printing system.