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6MB 공유 L3 캐시 2.3GHz, 2.6GHz, 또는 2.7GHz 쿼드-코어 Intel Core i7 프로세서 (Turbo Boost 최대 3.7GHz).

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Fans start then stop not 1 second only when powered by cable

Fans start then stop for not even 1 second, repeatingly, when powered by cable, no pushing of power button needed. when just battery, power button does nothing. tryed shift+control +alt+power button, fans stop, then on release the led goes orange to green and fans start repeating the cycle again and again.

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At this point I’m suspecting your battery needs replacing. What is the color of the MAgSafe charger LED Amber, green or not lit?

@danj @Shockinface360

yeah it sounds like that

Green to orange

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At this point it really sounds like your battery is bad.

Lets see if we can by pass the battery. Follow this guide to step 4 MacBook Pro 15" Retina Display Mid 2012 배터리 교체. Carefully sit the system on its side and press the power button, holding it for a good 15 secs to fully discharge the logic board. Now plug in the MagSafe charger alone, the system should spontaneous start up, did it? If not disconnect the MagSafe charger and reconnect the battery, then plug in the MagSafe charger, you’ll likely need to leave the system under charge for a good four hours before you can test things again.

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