My macbook having some problem with its battery recently. And at some point it drained all the powers and I could even start it, although I connect it directly to chargers.
So, after so much try to boot it up failed.
I found the following step able to make it start again.
Firstly, my Mac notebook computers have a non-removable battery.
It maybe applied to
MacBook (Retina, 12-inch, Early 2015) and probably later.
Shut down your Mac.
Unplug the MagSafe or USB-C power adapter from your computer.
Using the built-in keyboard, press Shift-Control-Option on the left side of the keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds.
Release all keys.
Reconnect the power adapter.
Press the power button again to turn on your Mac.
You will hear the chime when it successfully able to boot up.
Goodluck.