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There are four vertical lines, one pixel in length, running all the way down my computer screen, that are a different colour to the rest of the screen. It looks like they are vibrating up and down.

Also, in the middle of my screen, there is a box of pixels about 4 inches wide, from the top to the bottom of the screen, with the same problem.

Its a Mac so the motherboard is built in to the monitor, so I don't want to have to replace it if possible. Does anyone have any ideas about what to do?

(p.s sorry for the really bad explanantion)

Edit: This isn't it, but it looks like the bit in the middle: