Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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My MacBook Pro will only start after a SMC reset.


Can anybody help me?

My MBP will only start after a smc restart, i can restart him when he is on but when i turn him off he wil not start again. I've tryed everything but nothing works.

NVRAM-reset, hardware test a complete clean install. System check.

Battery looks fine:

Informatie batterij:

  • Serienummer: W031642YHD3LC
  • Fabrikant: SMP
  • Apparaatnaam: bq20z451
  • Pack Lot Code: 0
  • PCB Lot Code: 0
  • Firmwareversie: 201
  • Hardwarerevisie: 000a
  • Celrevisie: 165


  • Resterende lading (mAh): 5144
  • Volledig opgeladen: Ja
  • Bezig met opladen: Nee
  • Volledige laadcapaciteit (mAh): 5144


  • Aantal cycli: 107
  • Conditie: Normaal

Batterij geïnstalleerd: Ja

Ampèrage (mA): 0

Voltage (mV): 125


Battery Information:

  • Serial Number: W031642YHD3LC
  • Manufacturer: SMP
  • Device Name: bq20z451
  • Pack Lot Code: 0
  • PCB Lot Code: 0
  • Firmware Version: 201
  • Hardware Revisio: 000a
  • Cell Revision: 165

Charge Information:

  • Charge Remaining (may): 5144
  • Fully Charged: Yes
  • Charging: No
  • Full Charge Capacity (may): 5144

Health Information:

  • Cycle Count: 107
  • Condition: Normal

Battery Installed: Yes

Amperage (mA): 0

Voltage (mV): 125

Update (01/16/2016)

Nothing got wet, it started after i replaced my ssd, he works perfect just won't start after i shut him off. Restart also works.

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Just looking at the battery info you have provided here its not the battery.


Did you get your system wet at some point or do something else to it that might be a factor? How about checking the thermal sensors to see if the system is over heating. Download this app: TG Pro paste a screenshot of the output for us to see in your question.


Who's SSD did you put in (Make & Model)? And did you add it Vs swapping out the HD?


I put in a Samsung 850 Pro 512GB but first cloned him with Superduper! My old SSD was a Kingston HyperX 240 GB


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1 Answer

Most Helpful Answer

I would try reformatting the SSD and during the OS install use the migration assistant services to copy over the files from your old drive. Cloning software doesn't do to well on the newer OS-X's. I suspect you'll find a clean OS and a the account & file migration will set things right here.

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After i got the problem i formatted the disk wit a USB install disk. So now i have a clean system but problem stays.


OK, Lets try taking the SSD out and connect it via a SATA to USB adapter is the system stable now?


First i have to get a SATA to USB adapter, will do that tommorow.


System runs stable but only starts as i said before


I suspect you have a logic board problem here as you've removed the SSD & the SATA cable from the equation. This will require some effort to isolated out what part of the power circuit is failing. Without circuit diagrams and a good digital multimeter we're just shooting in the dark. I think it's time for you to visit an Apple Store to see what they can do for you.


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