My Late 2013 Retina MacBook Pro 15" showing black screen on boot. If I connect MagSafe its working sometimes. I tried an external monitor. Its working perfectly when MagSafe connected. When I remove the power adapter the external display also goes to black screen.
Anyone can help?
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If it is the battery you may be eligible for a free repair program. To check if your qualifying MacBook Pro needs battery service, click on the Apple logo in the menu bar. Then, click on About This Mac > System Report > Power. In the Health Information section, the condition should say "Service Battery."
Let us know your findings.
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From the sounds of it, it sounds like the battery either went out or there is an issue with the battery cables.
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