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원문 게시자: DrugStar ,

본문:

Had this exact same problem (repeating boot chime loop, inability to use any startup keyboard commands) My issue was caused by my inserting a usb with Clover on it into my genuine Apple store purchased macbook pro retina & proceeding to &&^& around like an idiot. This resulted in my deleting the efi bootloader or some $@$*.

Took it to Apple, who wanted to replace the logic board at a ridiculous cost despite saying that all their tests regarding the physical condition of the machine and it's components passed fine. I tried explaining what happened, but the default response was simply to swap the motherboard for what was basically the cost of a new macbook pro.

Purchasing and installing this Chipmunk Matt card FIXED the problem:

http://www.cmizapper.com/products/mattcard.html

It was easy as !&&* to install, I booted right up into MacOS, and all works well, except the serial number displayed under About This Mac changed. Not sure what that means, but &&^& it. I hate Apple so much I'm trashing this machine anyways lol

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