1
Remove the power cable from your laptop.
Press and hold the power button on the case of your laptop for 30 seconds.
Wait 30 minutes
Reconnect the power cable and start your laptop, is there an image on the screen and if so, does it boot into Windows?
2
If there is still no image on the screen, start your system and wait until you think Windows has completely started, then connect an external screen to every available video output port to check if you can get an image on the screen.