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Apple's line of laptops for professional and power users. To date the MacBook Pro line includes 13, 15, 16, and 17-inch variants, with major revisions defined by unibody, Retina display, and Touch Bar designs.

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MacBook Pro starts when plugged in. with battery/without battery also

MacBook Pro year 2012

MacBook Pro starts when plugged in. with battery or without the battery also. Can't start system with power button. (power button is not responding)

When i plugin the MagSafe adapter the system starts up automatically. I tried after taking out the battery, results are same.

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Can you give us the exact model here. Paste your systems S/N here: EveryMac - Lookup, then paste the info here so we know.

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I have a similar issue.

My Mac does not starts if it is not connected to power. and even if it is power on using the adapter, it gets too slow.

MacBook Pro "Core i5" 2.5 13" Mid-2012

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I hаd a similar іѕѕuе with my Mac when it was refusing to charge despite being plugged in. Had to resort to researching on the internet to find a solution.

Fіnаllу I mаnаgеd to resolve thе problem.

Follow thіѕ guide hеrе: https://bit.ly/3CrZNNw

Hope thіѕ helps

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Hi, I'm assuming you have an A1278 MacBook Pro from 2011 or 2012 with an i5/i7 processor as these laptops start up automatically when connected to power. The issue with the power button can be caused by the logic board or the keyboard, and is usually a fault of the keyboard. To determine the issue, try to start the laptop up by shorting out the power-on pads on the logic board (search : [your macbook model] power on pads to get the location) with a screwdriver or tweezers. This will send the SMC_ONOFF_L signal to ground, telling the logic board to turn on. If this doesn't cause the macbook to turn on, then it could be an issue with the logic board. If this does work, then you will need to replace the keyboard.

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Seems like the common case of dead battery syndrome. When you get to your desktop, go to the apple logo in the top left, about this mac, system report find power on the left side and take a screenshot of what it says and post it here. If it says that condition is not normal, says theres no battery or if the cycle count is over around 600 your battery is shot and you need a new one. Do all of this ofcourse with the battery plugged in.

Hope this helps and good luck fixing!

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Hi thanx for your Quick reply.

Shows battery status normal and 500 + cycles only.

Since long ago i running my mac without battery.

Power button not working. The only way to start mac is connecting megasafe.

Without pressing any button it will starts automatically.

My question is if battery is defected Why it's starting automatically when there is no battery connected to my mac?

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No clue, i actually had a similar problem with a macbook i had. Have you ever spilled liquid on it? There could be a connection issue. You might need to completely replace your keyboard in order to fix this.

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Also, you could try resetting smc and PRAM but the problem is you need the power button! And if you cant use it then you cant reset them. And if you battery is still in good condition, it probably is a keyboard problem and it looks as if it needs to be replaced. Im not sure on that, however, new ones are only around 20 dollars on ebay so they arent super expensive.

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no liquid issues in my case

crwdns2893770:0crwdnd2893770:0crwdne2893770:0

battery sometime giving problem. IF BATTERY IS CONECTED SOMETIMES WONT START MY MAC. in this case i have to disconnect battery and connect megasafe to starts mac. my doubt also on battery. but don't understand if no battery connected also mac function is same.

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on the left side of your mac you have a button with 7 lights, if you push the button, are all the lights going on or is there just one blinking?

if there are more lights blinking the battery is working, in that case it's most likely there is something with the keyboard.

it is possible that the keyboard cable isn't connected properly or damaged. or that your keyboard has fluid damage.

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hi thanks reply.

all lights are blinking when i press the button..

i will open and check key board cable tommorow. iam sure that no fluid damege.

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all lights blinking means no battery, which means it doesn't recognize a battery.

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I got the same problem. I have try reset SMC & PRAM, remove battery & RAM, reinstall MacOS High Sierra z which all does not work.

My battery condition show Normal & actually i just change the new battery two months ago only so it's new & does not charge many cycle.

I suspect might be because install some software & crush the system in MacOS high Sierra.

As after i upgrade the MacOS High Sierra, it's working normal but after I upgrade the software due to compatible problem. It start to have this problem. I had tried to uninstall some program but still some did not do it yet as I need to finish some project on it & I afraid can't get back the software later so did not try yet. After I finish the project, will back up the data & try to uninstall all the upgrade software.

Might be you can try if you got the similar situation or if you have already solved your problem, kindly keep me update.

I will update the result after I uninstall all the software too.

Let's keep in touch !

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Dear please help me for this . My mac book battery in fully faulty so when i disconnected the battery then mac book power not work no start with out battery . i want to use my laptop without battery so what can i do for start my mac book pro A1278 .

Thanks

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Please reply

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I took my mbp to the icare and they removed the dead battery and then i start having this problem … my mbp 2011 start by itslef when plugged in .

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@yarangula URALI

Not sure if you ever solved this issue, but I am having 99% the same issue you are having.

The computer only turns on after I have unplugged the battery, and auto turns on after plugging in the mag safe power cord to the computer. The computer turns on without even pressing the power button.

This particular computer might have experienced some water damage as I had to replace the logic board to get it to even display a picture on the screen.

One way you could test to see if you have a faulty power button is to boot the computer, and see if you can force shut down the computer holding the power button down.

This is something I just tested, and just noticed I can not turn off the computer holding down the power button, so I am assuming there is something faulty happening with the power button.

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I have the same problem, Macbook Pro 13* 2012, after break plastic coating (blue one on mbp 13” 2012) on MagSafe Port. Did you have that that cause too? If yes, maybe the problem is that the paper/sticker coated.

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Hi, did you figure out how to solve the problem? Got the same issue after calibrating battery with broken charger cable.

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I forget, but I think this is not the issue. I replaced my keyboard and the problem is gone.

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I chatted with an Apple Advisor and she told me to reset system power management on the computer. I have a MacBook Pro early 2011. The steps are mentioned below. It didn’t work the first time so I tried twice. After the steps were completed, my MBP is not starting automatically when I connect the charger. I have to press the power button to start the computer (and that is how it should be).

(A) On the Mac, press and hold the power button for 10 seconds and wait 30 seconds before proceeding with the next steps

(B) 1. On your built-in keyboard, press and hold all of these keys:

• Shift  on the left side of your keyboard

• Control  on the left side of your keyboard

• Option (Alt)  on the left side of your keyboard

2. While holding all three keys, press and hold the power button as well. 

3. Keep holding all four keys for 10 seconds.

4. Release all keys, then press the power button to turn on your Mac.

(C) Once the computer is on, remove the charger, shut down your laptop. Then connect the charger. Hopefully, if you followed the steps, your issue will be resolved.

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This solution works for me! I tried it many times (at least with three batteries). Every time I changed the battery, the problem appears: autostart when plugged in. Now, after I changed the battery I need to run this command on the terminal!

$ sudo nvram SystemAudioVolume=%80

Actually, the command is to disable startup sound, but it works too to prevent autostart when plugged in. Probably, the actual solution is to reset nvram, as I did in the comment above.

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I had the same problem and for me, it worked like this:

press together <ctrl><alt><cmd> and the <power button> for a few seconds, and then it turns on without the power plug.

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Didn’t work for me but thanks anyway. My battery was charging after installing the first time but since I wanted to calibrate the battery I let it get completely empty and ever since it’s not recognizing the battery anymore so I have to keep it plugged in all the time. No worries though, not using Apple anymore with all of their surveillance.

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