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2011년 하반기 모델, A1278 / 2.4 GHz i5 또는 2.8GHz i7 프로세서.

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Unrecognized battery after HDD and RAM upgrade

After everything done, following your guide. The mac is working properly, except for the battery, that is working, as i can sometimes turn on the mac, with a loud fan noise on battery mode.

With AC power connected it runs good, but there's a cross on the battery indicator, indicating that there no battery.

How can i solve this? what steps should i follow exactly to make my battery recognizable again?

(tried already some solutions, on plugging/unplugging the battery connector with and without AC power plugged in)

Thanks in Advance

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Is the X red or black?

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Did you solve that? i have exactaly the same problem on the same model

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it's black;

update: the apple hardware test don't recognize any problem. Tried several ways to do de SMC reset, with no results whatsoever (that includes the shift+ctrl+cmf+power several ways; and the unplugging of the battery connector, followed by the "battery reset" (if i can call it so...)

i still think the battery alive, since i've managed to turn on the pc on battery twice (thus the cross was still there, and the fan's were working at full speed)

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