Hi, I am Dave, I will help you with this.
1
Try pressing Win + Ctrl + Shift + B to restart the graphics card
2
if that does not work, try booting Windows into Safe Mode, is the screen correctly lit in Safe Mode?
Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
Do this twice
On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt... etc.
Go to Troubleshoot - Advanced Option - Startup Settings and click Restart
Upon restart, press 5 to enter Safe Mode