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Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Replaced battery - won't turn on

Model A1342. Old battery was swollen - MAC worked fine. But made me nervous. Bought new battery and installed. Everything went fine. Charged with MagSafe Orange then green + 2 hours at green. Nothing. No response to power button or any of SMC resets.

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Выбранное решение

Let’s do this: Take the battery out, now with nothing connected press the power button for a good 15 secs. Now plug in the MagSafe the system should spontaneously start up, did it and is the MagSafe LED Amber or not lit at all?

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Did as suggested. Did NOT start up spontaneously. Light is green. Power button: no response. (Battery still out)

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Is it possible that the old battery, which was swollen, damaged a component forcefully? I put the old battery back in and it also doesn't work now. (It worked before eI started disassembly but swelling made me nervous.)

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FIXED! Last gasp attempt. Took out memory and replaced. Tightened all the screws I could see. Wiggled anything the battery might have pressed on. Did an SMC reset. (Said some prayers for patience.) and it started after about 10 seconds on the power button. Not a satisfactory fix but allows user to make sure everything is backed up. Thanks for your attention.

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The battery fault with New one

its sounds like the replacement battery may be faulty as the replacement supposed of charged so recommend contacting the seller and asked them for a replacement .

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See my other comment answer. Battery is apparently okay but old battery may have moved/damaged components. Fixed for now. I was going to return battery per your suggestion as last step. Thank you for your assistance and suggestion.

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RICHARD BEYER будет вечно благодарен.
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