Try going to device manager and find your graphics card. Right click it and go to properties click disable then your screen should go black for a second then when it stops being black re-enable the device. Your graphics card should be found under 'Display Adapters'.

I hope this helps!

Try going to device manager and find your graphics card. Right click it and go to properties click disable then your screen should go black for a second then when it stops being black re-enable the device. Your graphics card should be found under 'Display Adapters'. I hope this helps! :D