Problem : Display working in Safe Mode but not in normal mode.

Troubleshooting :

:!: Check whether the display is working by projecting a torch light.(Laptops).
:!: Check whether the Laptop is working with external display.

Solution : 

1. Enter the BIOS mode by pressing F2* on the keyboard while booting.
2. Reset all the settings to default.
3. Exit the BIOS mode by saving all the settings.
4. It should work fine : for problems comment below.

*Might change for different computers.