Hi,
Please do try these troubleshooting steps that may help.
- First is to do a hard reboot, 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 the same problem will persist, connect an external monitor and see if you'll get a display from it or not.
- If there's still no display from the external monitor do reset BIOS.
- Open the laptop and remove the CMOS battery for a second then put it back in. (Make sure that the laptop is completely OFF)
Hopefully this steps will help.