![]() If the external display also shows the black lines, then the issue may be with the graphics card. If the external display works fine, then the problem is likely with the MacBook Pro's display. This can help determine if the issue is with the display or the graphics card. Connect your MacBook Pro to an external display. Release the Shift key when you see the Apple logo.ģ. Press the power button to turn on your MacBook Pro. This will load only the basic system files and drivers, which can help determine if the issue is software-related. Release the keys and let your MacBook Pro start up normally.Ģ. Turn on your MacBook Pro and keep holding the keys until you hear the startup sound twice. Hold down the Command + Option + P + R keys together. This can help resolve some display issues. To troubleshoot the issue, you can try a few steps:ġ. The black lines on the screen could be caused by a variety of factors, such as a loose connection or a malfunctioning component. It's possible that your MacBook Pro is experiencing a hardware issue with the display or the graphics card. ![]()
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