Black screen with vertical lines
My Mac book prob suddenly went into a black screen with a few vertical lines on it yesterday as I was in a zoom meeting and I haven't been able to fix it. Help is much appreciated!!
MacBook Air 13″, macOS 10.14
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Try connecting an external display. You may need to enable Clamshell mode by closing the lid in order to get video onto the external display.
Try a forced power off by holding down the power button or performing an SMC reset.
If the external display is Ok, then your built-in display is defective. Otherwise you likely have a defective Logic Board. Both of these will require a repair, but at least with the former you can continue using the laptop with the external display until the laptop can be repaired.