Hi,
Have you also tried the charger of the other laptop with your laptop that is currently not booting up? If it will work do try these troubleshooting steps that may help.
- Reseat the RAM, take them all off for couple of seconds the put them back in making sure that they are all seated properly then see if it will boot up.
- If these will not work the problem may lie on the motherboard of your laptop and if its still covered by the factory warranty do contact Asus support for a repair.