How to repair my broken monitor?

So... I've been using this monitor for over two years, and suddenly it just goes dark mode. The whole screen is super dark. The brightness setting doesn't do anything. And there's a little part of the screen (about the size of a fist) that's a lot darker than the whole other part. Note: I... show more So... I've been using this monitor for over two years, and suddenly it just goes dark mode. The whole screen is super dark. The brightness setting doesn't do anything. And there's a little part of the screen (about the size of a fist) that's a lot darker than the whole other part.

Note: I didn't drop it or anything, and there's a lot of dust in the room.

Also Note: All I want to know if is it fixable? Or do I have to buy a new monitor?
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