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Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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My trackpad stopped working. I installed Yosemite and now it works?

I have a mid 2009 13" macbook pro. The bottom left trackpad was all but non functional. I was about to replace it and thought if I installed Yosemite it might have caught a driver to improve function. It now works perfectly. Is there a driver missing in Lion that Yosemite fixes? I am unable to do D or option D to do a diagnostics as it won't work. I also do not have the original system install disc so I can't figure out a way to do a self diagnostic.

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Can you give us the last four digits of your serial number so we can correctly identify which model you have.

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066E is the serial number. Thanks.

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Just luck I'm afraid.

Did you spill something on the keyboard/trackpad at some point?

The other thing here is the battery in some units swell up causing pressure against the trackpad.

As you didn't ID which exact model you have I can't offer you much more here.

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Nothing spilled. I did take out the battery to get to the trackpad. I checked for the swelling and it was ok.

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