Anywhere in your laptop, physical or electrical damage can cause a short circuit. A short circuit will consume all available power, causing your laptop to not turn on. If your power adapter LED comes on when you plug it into the wall, but then goes off when you plug in the laptop, you probably have a short circuit.
Try to pull the battery and unplug the laptop from the external power source. hold the power button down for 3-5 minutes. Plug everything back in to see if that works. if not, your laptop may have a reset button, you'd have to poke it with a pin