Why my printer refuses to wake up from sleep mode?

I have a samsung printer SCX-3405 and it refuses to start. It seems like it is on sleep mode and will not change its status whatever I do . I tried to unplug it and then press the power button again but it still doesn’t work. The power button light is on…the usual soud that tells you the printer is awake and also the lights that indicate the number of pages that are to be printed are gone and I don’t know what to do. If anyone has a solution please let me know.