White Laptop Screen - What causes a Laptop LCD Screen to turn Completely White?

There are 2 main reasons for a white laptop screen:
  1. A defective LCD screen or motherboard (where the graphics are integrated), or
  2. A loose connection between the video cable and the laptop screen.
Usually the reason is #2, which can be fixed by reconnecting the video cable. If not, then you'll need to replace the laptop screen.

To troubleshoot quickly & effectively, get a functioning LCD screen from another laptop. This will be useful in case you need to replace the screen of your defective laptop.