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  • SanderDK Level 1 (0 points)

    Thanks alot for this post, helped me out alot I appreciate it!

  • monicasood Level 1 (0 points)

    Does reformatting the macbook help anyhow? I've done all of the things mentioned, but nothing seems to work for me...
    My mac is a year old and occassionaly used. You never expect these kind of issues from a mac!

  • tony_stead Level 1 (5 points)

    Monica, I reformatted the MacBook I was having problems with and it didn't make any difference.


    Try it though, do a Time Machine backup first, format your disk and install a fresh system from the disks that came with your MacBook. Then restore from your Time Machine backup. If you still have the problem, try following my previous instructions exactly, step by step.


    If that still doesn't work try upgrading to Mountain Lion via the App Store. As far as I know this only happens with Snow Leopard.

  • Yodler Level 1 (0 points)

    Monica, I have been to the Genius Bar in Stanford. All tests were done there and no problem found. When they told me that they would reload the OS X I took my MBP back home to perform another back-up (to be safe) and then proceeded to download the OS X from the Apple Server myself incl. reformatting the disk - which can take many hours. With just the newly installed OSX 10.7.3 running the problem re-surfaced with first just 50 to 60% System CPU  and soon again up to 80% - our original problem. I then proceeded to load all user files from the back-up and of course the problem with sluggish performance while running on a healthy, fully charged battery continued - until I found and took out the kext file for my MBP type. Since then I am ok as new, monitored temperature und fan speed and for the last 2 months since the removal of the small file it runs fine.

  • monicasood Level 1 (0 points)

    Tony, Yodler, the kext file does not exist on my laptop. Reformatted the laptop last night, it's still the same. System CPU shoots upto 80% once the mains are unplugged. Is there ANYTHING else that I could do?

  • SanderDK Level 1 (0 points)

    This happened to me on Mountain Lion. Deleting the file helped but the problem occured again after a week or so, deleting it again has helped so far...

  • manojksh Level 1 (0 points)

    Thank you very much. its working fine for me..

  • kakrala17 Level 1 (0 points)

    thanks buddy my macbook pro running fast now,after deleting taht file

    Thanks a lot

  • theuserenjoys Level 1 (35 points)

    Thanks a lot to tony_stead. Fixed my problem!

  • Nökkvi Level 1 (0 points)

    GENIUS!!!!!!!! THIS WORKED FOR ME !!!!!





    Try this at your own risk - It Worked for me after a complete system reload which didn't make any difference.


    I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


    I did this on a  MacBook Pro Early 2011 - 2.7 GHz Intel Core i17

    System Version 10.6.8 Snow Leopard


    Running well on mains power but dramatically slowing down when running on battery power


    First try this  to see if you get the same result I got


    Quit all programs

    With the mains connected

    Open Activity Monitor and click on CPU in the bottom half of the window

    Check the CPU Usage graph - It will probably be minimal - Under 1%

    Now disconnect the mains and watch the graph shoot up and CPU activity around 80%


    Here's what I did...


    Again - I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


    Firstly, you’re going to need the model identifier of your Mac,

    go to the Apple in the menu bar and select "About this Mac"

    When the About this Mac pane appears click on "More info…"


    Select Hardware in the left panel

    In the right panel make a note of the Model Identifier  e.g. "MacBookPro8,1"


    Now open a finder window and click on Macintosh HD

    Click on system >Library > Extentions

    Find the kext file called IOPlatformPluginFamily.kext

    Right click it and Show Package Contents

    Click on contents

    Click on Resources

    Click on PlugIns

    Right Click on ACPI_SMC_PlatformPlugin.kext

    Right click it and Show Package Contents

    Click on contents

    Click on Resources

    Find the the plist file that corresponds to your Model Identifier e.g. "MacBookPro8,1.plist"

    Move it to the trash and delete it

    Restart and everything should now be fine.

  • cordialmente Level 1 (0 points)

    Thanks a lot Tony, I had the same problem and now it seems fixed!


    The slowness problem occurred to my MBP after a milk leakage (!!) that blocked for a week the mac... It was died, and to restore it I put it opened in a box with 1 kg of rice, and after a week it started again to work properly, except for the slowiness when unplugged from the main.  Now I deleted the plist file "MacBookPro7,1.plist" following your suggestion, and it works fine... thanks again!!!!


    My doubt is: what could happen now, without that system file? I am taking some risks (for example: some sensors are not checking the temperature of the battery, and it is no more under control)?


    Do you know what exactly should that file do?


    I looked for this info on the web, but without any result...

    Thanks in advance for your reply!

  • Abhishikth Karumanchi Level 1 (0 points)

    see i already ried this a few months ago, in june of 2013, i had water spill on mac, which burned few components and i got them repaired by a service centre(not apple). it costed me around 5k INR. but after that repair my mac was slow without charger n i saw this thread n it worked fine except sometimes it used to shut off over heating if i played some heavy game or used photoshop n agter effects for a long long time. but it would restart again but by december one day my mac completely shut off...then i took it to a mac service centre..there they checked it n said the logic board stopped working n i had to get a new one for 35K INR. so i think u better get ur mac to service at a service centre recognized by apple for any damages and extend warranty for atleast 1 year just in case **** happens.

  • Maxom BGA Level 1 (0 points)

    This is Logic Board Problem . 100 % Hardware problem .Get it repaired..

  • jasonzuheb Level 1 (0 points)

    Worked for me too.

    Thank you so much!!!

    You save me

  • leejay87 Level 1 (0 points)

    Bro, you're such a f*ckin GENIUS!!! thaaaaanks!!!!