Hi,
Please do try these troubleshooting steps that may help in resolving the issue.
- Unplug the AC adapter from the laptop then press and hold the power button for 20 seconds the try booting the laptop again.
- Next to try is to reseat the RAM, remove them off the laptop for couple of seconds then put them back in making sure that they are seated properly.
- If all these will not work contact Asus Support for a repair already if it's still covered by a factory warranty.