The SMC on my 2012-MPB keeps corrupting, causing the computer to not wake up or restart. I've tried resetting it multiple times, but the issue still occurs.

The only solution I've found is disconnecting and then reconnecting the internal battery, which is quite problematic. Is there anything I can do to solve this issue?

  • This is becoming a big problem, and I'm having to reset it constantly. Is there a permanent fix for this?
    – Sam
    Nov 22, 2018 at 16:41
  • How did you determine that your SMC is corrupted?
    – Allan
    Dec 4, 2018 at 12:36
  • From here @Allan apple.stackexchange.com/q/340748/305111
    – Sam
    Dec 4, 2018 at 14:54
  • That's not a diagnostic for a corrupt SMC. Are you saying you're having brightness issues?
    – Allan
    Dec 4, 2018 at 15:55
  • No, I also am having waking up from sleep issues, and a couple of other issues that Apple mentions. Also, resetting my SMC fixes the problem, at least temporarily
    – Sam
    Dec 4, 2018 at 15:58

1 Answer 1


SMC problems could be related to the battery itself. That age of laptop doesn't have a separate battery - as in the average non-Apple motherboard which has a CMOS battery on the motherboard, so SMC would be using battery power to store settings.

If the battery's shot, SMC loses it's settings at whatever point the battery drains itself.

See if you can borrow another of the same model with a healthy-ish battery to test with for a bit...

  • I have two identical computers, this is happening to both. Unfortunately (which kinda makes sense why this is happening now) neither have batteries :/ one of them died yesterday. Would it make sense then that when they are plugged in, after restarting with no battery, that there are SMC problems?
    – Sam
    Nov 23, 2018 at 3:24
  • if the SMC settings are getting dropped every time the battery drains itself, then yeah, it would try to rebuild them on the next restart(which probably looks like it restarting a bunch of times on its own, then finally figuring it out and starting up). plugged in would only hold the settings as long as it's powered on, since there's no backup battery for those settings.
    – s1ns3nt
    Nov 23, 2018 at 16:13

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