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Hi all I have got a blue vertical line on my MacBook Air (mid 2013 ver). When I switch to external LCD display, I don’t see the vertical line. Does that mean, the LCD panel need to be replaced ? Thanks all. Regards Kenz

Sadly, yes. What likely happened is you banged your system on the lid area or sat something heavy on it. Here is the IFIXIT guide you’ll need to follow to replace it: MacBook Air 13" Mid 2013 Display Assembly Replacement, and. Here is the part you’ll need: MacBook Air 13" (Mid 2013 through Early 2015) Display Assembly - Apple P/N 661-7475.