Why does my washing machine make noise when not in use?

I woke up this morning to a strange noise coming from my laundry room. My washer seemed to be making a noise that sounded like it was slightly running (not agitating or filling with water, just kind of humming). The noise stopped when I unplugged it. But when I tried to turn it on to run a cycle, nothing happened. None of the lights turned on or anything at all. When I plug it back in, the sound starts again after about 5 to 10 seconds.

The noise seems to be coming from the water drainage hose. It is like it's trying to empty water from the machine but it's not turned on.