Try to press the laptop’s screen frame with two fingers. Is there any difference? Does the white part change?
Do you get half image since laptop turn on or only in Windows?
To tell you the truth, this may be a cable issue or a screen problem. Whatever the problem is, you should contact the seller, especially if the PC is under warranty.
If warranty has expired, you should seek assistance from technician. The laptop should be opened and examined.
Hope this helps