It has probably died. you can try making a small hole in the shell right where the beak is. I use the pointy corner of flat tweezers to scratch a hole in the shell, but a drill bit, or even a pair of scissors might work. if after you can see it's beak it is not moving, then it has died. If it is moving then you can put it back under the heat.I never heard any chirping, just the tapping. I candles this morning and can see the triangle of the beak poking into the air sack but no movement that I could see. And no tapping this morning.