Hi,
Do a hard reset first, remove the battery (if not built in) and AC adapter then press and hold the power button for 30 seconds and try booting it back up. If that doesn't work and you see all the light indicator on your laptop and the fan is spinning telling you it's on but there's no display, press "fn + F5" at the same time and see if you'll get any display from it. Next is to try and connect an external monitor if available and see if you'll get any display from it because if you do try to press then Windows key + P then select "Display only" and press Enter. If all these doesn't work you may need to contact the manufacturer if it's still under the factory warranty for repair.