Chosen Solution
Screen just goes black and nothing I do make a differnc, and then ten minutes later it just starts again. Happens both when charging and not charging and doesn’t appear to be precipitated by any particular action. It has happened maybe twice in the last couple of months but now 3 times in two days.
I had the same problem. You should probably replace the logic board. It is expensive and you can ask them for help in the apple store.
