I have Mabcook Pro M1. It was working fine for two years. Then a month ago its screen went black and wouldn't turn on even though I could hear the power up sound. I opened it today and turned it on. It started fine but then a few minutes it went black again. Now it's in the condition shown in the picture with a few extra lines in the middle. I restarted it, the apple logo appeared fine followed by the lines again. Can anyone explain this?