Take a external monitor and hook it to the video output on the back of your laptop, if it works then you know the video graphics card is fine, it means that the lcd display is the problem. Now if the screen appears good, you may have bad inverter board, back light, cable from the video card to the screen has come off, or the circuit board on the back of the lcd is cracked. If there is no change on both screens this is a motherboard issue that contains the video graphics card.
Unlikely to be a vga cable loose, but you can check by removing the switch panel cover and the screen to check it is still firmly housed.
test the laptop first in an external monitor, if you get an image, then the graphics chip is still ok
This then points to the screen, may appear undamaged, closer inspection with a torch, shone through the back of it will show any cracks you do not see straight away.
If the screen will not light up, fault is probably with a damaged backlight or inverter, you are then looking at a new (or 2nd hand) screen
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