1) Press and Hold the On/Off button for 1 sec. until the printer shuts off.
2) Unplug the USB cable and then the power cord.
3) Press and Hold the power button for 1 sec. this should turn the printer back on.
4) Wait 10 minutes, then plug the power cord back in and then the USB cable.
5) Press the power button to turn it on again. that should get you working.