So on my MacBook, I've noticed that there's a faint purple discoloration in the middle of the screen. It's not a GPU issue; i'm pretty sure it's an LCD issue. It's a horizontal purple line going from about 4 inches from the left to 2 rights from the right, and it's about 3 inches from the top. It also juts down about an inch about an inch from the middle of the screen (still coming from the line). What's causing it? Can I fix it? It's not super noticeable except when I'm watching a video. But it's still annoying.