Hi @ixluaxl ,
What is the full model number of the laptop as shown on the information label on the bottom of the case?
Do you get a normal screen at all as you said it happens on startup i.e. when just booting up, or it is there all the time once it has fully booted to the desktop?
If all the time connect an external monitor and check if the display on it is OK.
This is just to prove whether the problem is just with the LCD display or perhaps on the motherboard