Please do try these troubleshooting steps that may help in solving the issue.
- Start by doing a hard reboot, remove the battery and unplug it's AC adapter then press and hold the power button for 20 seconds then try booting it up.
- If these doesn't work try to reseat the CMOS battery from the inside of the laptop. Remove it for couple of seconds then put it back in then try booting it back up.
- Next to try is to reseat the RAM's, remove them all for couple of seconds then put them back in making sure that everything is seated properly.
- If all these will not work i'm afraid you'll need to have the laptop service with Asus.