Step 3: Observe whether there are vertical or horizontal lines on the external monitor. Click System Preferences-Display-Arrangement. Step 1: Connect your MacBook to the monitor. If your MacBook does not have an HDMI port, you also need to prepare a USB-C to VGA converter. To diagnose whether it is a software or hardware problem, try connecting your MacBook to an external monitor. We can make judgments based on the following methods. There is a problem with the computer's motherboard or graphics card.īefore repairing the problem of your MacBook screen vertical lines, the most important thing is to know which component is wrong. The screen cable is loose or damaged, causing problems with the screen display.ģ. The MacBook was dropped,damaged to the screen.Ģ. There are several possibilities that may cause this problem,ġ. When there are horizontal/vertical lines appear on your MacBook screen, Possible Reasons for Vertical Colored Lines on MacBook Screen: What if there are colored lines on MacBook screen? 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.
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