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2.5 GHz dual-core Intel Core i5 processor (Turbo Boost up to 3.1 GHz) with 3 MB shared L3 cache.

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Turning on problem. It self-starts on charger. Boot ONLY with Shift.

Hi,

When I connect the MagSafe charger to the laptop, it turns on by itself. As soon as the Apple logo appears with the loading bar, it turns off and not responding on power button only on MagSafe connection.

When I hold the shift key while powering up it goes into Safe Mode and the laptop doesn't turn off but I need to hold shift button pressed down, if I release the shift in a second the system will turn off again.

Recovery mode also turns off when the logo is loaded. Any idea? Thank you for your reply.

Update (09/01/2022)

I have the idea. Is it possible that Is power button still pressed? And that a reason why it always turn on and in second turn off and only way how to stop shut down is keeping pressed shift?

Because when I'm in the Safe mode and release shift key that show me screen for shutting down options (sleep, shut down, restart,...) And immediately shut down. And not responding startup like before for plug in MagSafe charger only when I disconnect the battery. How can i check it? Is any way?

When I disconnect keyboard while booting, the system works correctly (without keyboard).

Maybe new keyboard will fix it or is there any way to repair stuck power button on current keyboard? Button is not pressed down.

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Sounds like a messed up keyboard! Did you have a liquid spill at some point?

You may also have a worn-out battery as well given the systems age. So your system is mostly dependent on the MagSafe charger so when you bump the system the power is disrupted.

Inspect the MagSafe charger cord and socket to make sure they are clean. Hopefully they aren't like this

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Or as dirty as the top one

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Or burnt like this one

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If you can install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question just don't bang the system to much!

Update (09/02/2022)

@jackun - Yes it dows sound like the keyboard is damaged. This series uses a unitized keyboard unlike the 15" models which used an independent blister switch as you can see here which sometimes is repairable on its own.

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Replacing the keyboard MacBook Pro 13" Retina (Late 2012-Early 2013) Keyboard its self is a bit of work! Basically following this guide MacBook Pro 13" Retina Display Late 2012 Upper Case Replacement then going to the next step of lifting the keyboard backlight and removing the few screws and a ton of plastic rivets!

You might want to save your efforts just getting the uppercase assembly! MacBook Pro 13" Retina (Late 2012-Early 2013) Upper Case Assembly Which will save your fingers and offers a better repair for a first timer.

MacBook Pro 13" Retina (Late 2012-Early 2013) Upper Case Assembly Görseli

Ürün

MacBook Pro 13" Retina (Late 2012-Early 2013) Upper Case Assembly

$149.99

MacBook Pro 13" Retina (Late 2012-Early 2013) Keyboard Görseli

Ürün

MacBook Pro 13" Retina (Late 2012-Early 2013) Keyboard

$19.99

MacBook Pro 13" Retina Display Late 2012 Upper Case Görseli

Kılavuz

MacBook Pro 13" Retina Display Late 2012 Upper Case Replacement

Zorluk:

Zor

2 - 4 hours

iFixit Görseli

Kılavuz

Adding images to an existing question

Zorluk:

Çok kolay

2 - 5 minutes

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