Hi,
Here are some troubleshooting steps that I would suggest doing in that situation that may help in solving the issue.
- Start by doing a hard boot, remove the battery and unplug the AC adapter then press and hold the power button for 20 seconds then try booting it up again.
- If it will not work reseat the RAM's, remove them all for couple of seconds then put them back in making sure everything is seated properly.
- Next to try is to remove the battery off the laptop then try booting it up with just the AC adapter connected.
- If you can hear the laptop on but there's no display on the screen, connect an external monitor and see if you'll get a display from it.
- If you'll get a display from the external monitor press the Windows key + P at the same time and select "Computer Only". If this will not work next step would be to open the laptop and check the ribbon cable that connects the LCD to the motherboard.
- But if there's still no display on the external monitor that could mean that the motherboard is faulty already.