How to re-install Yosemite when recovery partition is mavericks?

Discussion in 'OS X Yosemite (10.10)' started by whitedragon101, Jul 6, 2015.

  1. whitedragon101, Jul 6, 2015
    Last edited: Jul 6, 2015

    whitedragon101 macrumors 6502a

    Joined:
    Sep 11, 2008
    #1
    2011 17" Macbook Pro

    I am trying to re-install Yosemite because Trim enabler is stopping the system booting (tried the fix at https://www.cindori.org/trim-enabler-and-yosemite/ didn't work).

    It says the last option is to re-install OS X from the recovery partition which will leave programs and data intact but install a new copy of the OS.

    However when I boot into recovery partition to re-install OSX it says Mavericks not Yosemite. How do I do a re-install of Yosemite ? If I download the Yosemite installer to an external drive can I re-install over the top from there, leaving data and apps intact?
     
  2. whitedragon101 thread starter macrumors 6502a

    Joined:
    Sep 11, 2008
    #2
    Just done it. Turns out you can install from a normal Yosemite USB installer right over the top of the old OS leaving everything intact. Awesome. (Wish windows could do this. Would solve a lot of problems there too)
     
  3. z31fanatic macrumors 6502a

    z31fanatic

    Joined:
    Mar 7, 2015
    Location:
    Mukilteo, WA USA
    #3
    I don't know about Windows on a Mac but on a PC, you can install a newer Windows OS on top of the old one and not lose anything. You choose the upgrade option.
     

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