I read the related entries. My Mac Air 11" from 2011 was charging intermittently when plugged in and shutting off suddenly regardless of battery charge level or adapter connection. This problem has been going on for at least a month. I have improved the condition and isolated the possibilities. SO Now:

-I have reinstalled OSX 10.9 (this was updated for firmware etc) -Virus Scanned and removed infected files -cleaned magsafe and adapter connections -replaced battery (which was working perfectly for months before this issue) it is still in very good condition. -main disk has been cleaned out and has lots of space

After the cleanup and OSX reinstall this morning, sudden shutoffs seem to have stopped.. If I wiggle the adapter/Magsf connection it will switch its status on the menu bar. The charging speed and efficiency are inconsistent... then on a hunch I plugged in a USB drive adjacent to the magsafe. as soon as I did this the battery went into charging mode at what seemed like an average rate... Magsafe area cooled off.. now after plugging and unplugging I have repeated similar result and my charge has reached 70%.

My only conclusion is possibly a physical problem with the magsafe i/o board (Ac adapter is also new).

What does someone more experienced reckon?

I'd like to know if there is some more direct way to verify that it is the Magsafe board? (I live in Japan and they don't want to touch anything because I changed the battery, regardless that I had no warranty left) also I/o boards are about $90 here, so I want to exhaust options...


  • So you had infected files? Maybe a decent chance they messed up your machine in some way "removing" them did not fix?
    – owlswipe
    Sep 3, 2016 at 4:16
  • So far the machine is behaving in a stable manner in keeping with some kind of physical problem.. likely the logic board or the MAG IO.. I think MAG IO because the USB drive makes it charge properly when installed.
    – Brendan
    Sep 6, 2016 at 22:46
  • Sounds logical, but I'm no expert (sorry).
    – owlswipe
    Sep 6, 2016 at 23:00
  • Yea, me neither.. I'm hoping someone with a firmer grounding than I can comment.. I've done a lot of research and I can not find any effective solutions besides "go to apple" . I may just try another store now that I have narrowed the possibilities.
    – Brendan
    Sep 6, 2016 at 23:14
  • Huh, if this was a dating site I'd be worried.. :) maybe a sticky issue, is there another site that might have more interested techies?
    – Brendan
    Sep 7, 2016 at 18:58

1 Answer 1


i CHANGED THE io board. it mostly fixed it. I did some sys maintenance which further improved things. Finally I realized that my original surmise was correct but that the power supply also hd faulty cable. now it runs like new.. mgsfe, as convenient as it seems.. has been nightmare of cable replacement for me.

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