IPhone 5s won't turn on? - 2

I have an iPhone and it wouldn't turn on so i thought it was just out of battery so i plugged it in for a while but nothing happened so i tried holding the home and power button and still nothing happened all there's is a black screen what should i do?

Press the power button in one time and hold it down for a few minutes, and then release the power button.

press the power button in again and hold it down for a few minutes, then you should see the screen light up with the apple logo.

Take it to the apple store