But first you left out make, model, age, story and more.
Today, cracked screens aren't as expensive as they were. If the screen is broken in all OSes, it's usually the screen. But I'm not there to confirm.
Get repair estimates and check YouTubes on how to replace it yourself.
My laptop screen is splited into 2 the right side is dim while left side is normal. Please help me this this screen problem or a cable.