ALTERNATIVELY there is a manual switch that tells the printer you have a new toner in there. On the left side of the toner there’s part of a black circle, it’s like 3 slices of a pie left, if you will, and if you turn that all the way counter-clockwise the printer will believe it’s a new toner cartridge. You have to sometimes pull the circle/knob toward you a little to get it to turn. There is a little arm off on one part of the circle — you’ll know when you see it— it needs to be spun until it’s pointing in between the two notches to the top of the circle, at like 12 and 1 o’clock