If your Samsung Galaxy SCX 3405W printer is not working properly, you may need to reset it. To do this, follow these steps:
1. Turn off the printer and unplug it from the power outlet.
2. Wait for 30 seconds, then plug the printer back in and turn it on.
3. Once the printer is turned on, open the cover and remove any jammed paper inside.
4. Close the cover and try printing again. If the problem persists, continue to the next step.
5. Press and hold the Stop/Reset button on the printer for 10 seconds. This will reset the printer and clear any error messages that may be displayed on its LCD screen.