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Answer to: My screen turns on but the screen flickers while showing random colorsWe have similar troubles with our MacBooks Pro. Unfortunately, authorised service told us every time that's the problem on main board and it should be replaced. Actually, these probles are connected to video adapters, but only solution we found is replacement of board. Anyway, we managed with Apple to replace our boards for free, because it's known issue and we have lot of computers from Apple.