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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
If I close the cover of my mac, when I open it again, I only get a black screen with vertical double blue lines. Last time it took 30 minutes of playing with the keyboard to finally get it to work. Now I have to leave the cover open permanently?!
MacBook Pro 13″, macOS 10.13
BLACK SCREEN WITH VERTICAL BLUE LINES
