My laptop just broken, i don't know why

I was writing a review on a "ireccommend" and got distracted for a while. Suddenly, my device shut down with a quiet clicking sound—hard to describe, but it sounded like a circuit breaker flipping. Now it doesn't react to the power button at all. I checked the cable connections, and everything seems fine. However, the LED light on the power adapter is off, and I can't hear the usual coil whine/electrical hum from it (I have hyperacusis, so I can usually hear that high-pitched electronic whistle). Is my power brick dead, or could it be something worse?