Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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when it is unplugged the mouse acts jerky

Hello I have a Mid 2010 MacBook Pro - it runs perfectly fine with AC Adapter connected (activity monitor shows ~ 1.9% for kernel use); however, when it is unplugged the mouse acts jerky and the performance is VERY slow - (activity monitor shows kernel jumps to ~98%+

did reset of PR and PMS reset, etc. safe mode start - but same result - laptop perfect with AC adapter connected , on battery all but unusable...

Went to Best Buy and they diagnosed that the power bus voltage was low...

I replaced the battery with an Amazon one - installed , but no difference. (By the way the Appel Diagnostics returned a defective battery because it was not an Apple OEM, but battery was fine)

re-installed the old apple battery, no difference - so going to give this cleaning a try - can I use spray electric disconnect cleaner?

Any advice about the problem would be greatly appreciated - ended up getting a new MacBook - but the old one can only be used like a desktop - okay but not a real plus....

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Same problem here! Macbook Pro Unibody late-2011 gets CPU spike when unplugged, jerky mouse included. I've replaced the battery also, no improvement.

What specific area needs to be cleaned? Internals look ok to me and I can't seem to see any really dirty areas.


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No don't use any sprays as they have oil in them very bad for your system!

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Use distiller water for corrosion or spilled surgery drink and isopropyl alcohol to clean again the areas to act as a dryer.


Thanks Dan

I eas thinking of CRC Lectra-Motive Electronic Parts Cleaner.

Says it degreases fast, removrs oil and dirt non-staining leaves no residue and is non conductive


CRC QD ( quick disconnect) cleaner

These are formulated specifically for cleaning electrinic components and boards.

Thank you


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Gerd will be eternally grateful.
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