Black lines are falling all over the screen. now what should I do?

Hi @hridoyislam

Has the laptop been dropped or gotten wet at all?

Try connecting an external monitor (TV?) to the laptop's HDMI port and check if the display from the laptop shown on it is OK. Don't forget to press the F8 (Fn+F8?) key to toggle the display between laptop screen only, external screen only or both on together.

If the display on the external monitor is OK then it is either a faulty/loose cable connection between the motherboard and the screen or more likely it is a faulty screen in the laptop.

Here's a video that shows how to replace the screen in the laptop, which may help.

If you determine that the screen is the problem, usually the Asus part number for the LCD panel can be found on the back of the LCD panel. Once you know the number, search online for the part number only to find suppliers that suit you best.