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모델 A1297 Unibody: 2009 상반기, 2009 중반기, 2010 중반기, 2011 상반기 & 2011 하반기

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Shut off during startup

Hi,

I've a MBP 2009. With time, I have more and more difficulties to start the computer. When the computer is "cold" (no boot for some hours) and you press the power button, it tries to start (2-3secs), and then shut off. So I restart, again, again and again. With tries, it shut off later. Finally, I'm able to reach login screen. Then the computer is stable and I've no more shut off. I can keep it running during 24 hours without issues.

It's like the issue is happening when the computer is not "hot" or needs energy.

Thanks

Update (02/19/2018)

Here is the result :

Block Image

It looks like the battery is fine ?

Update (02/27/2018)

Block Image

Thanks @mayer. I replaced the battery with a new "genuine" one. Unfortunately, it doesn't solve the issue. It is still exactly the same. I'm also surprised that even with a new battery, if I unplug the magsafe, the computer shutdowns 2 or 3 seconds after that.

I'm now wondering if it's not an IC issue related to power on the logic board. Maybe you have some more hints ?

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I notice that Coconut is showing a battery failure. I have the same machine on the bench now with a similar issue. But I also have the flu and unable to work on it yet. Will try to remember to get back to you with my finding in a couple of days. If I forget (highly probable, given the way I feel right now) shoot me a reminder in a few days.

Hello @mayer. Did you find a solution ? Thanks

You replacement battery is showing a failure while the original one didn't.

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선택된 해법

The 17" machines seem to need more of a startup boost the the 15 or 13 inch machines. I would look at the health of my battery by using Coconut Battery to see if it still has the strength to do the job.

http://www.coconut-flavour.com/coconutba...

UPDATE

It appears your battery is the original one and about nine years old. Frankly I would replace it.

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