Installed public Beta; Cannot Boot to other Partition. Please Help!

Discussion in 'OS X Yosemite (10.10)' started by Visionblue, Jul 25, 2014.

  1. Visionblue macrumors member

    Joined:
    Jun 16, 2013
    #1
    I installed the Public Beta of 10.10 this morning on a new partition on my SSD. After setting it up I wanted to return to my main system only to find it was no longer available after booting with the option key.

    I had read Yosemite would mess with partitions but my only options are to boot to my Yosemite partition or a recovery partition. Not my SSD or HDD.

    I didn't backup. Such a stupid rookie mistake. I just didn't foresee losing my option to boot to my main system. Any advice would be sincerely appreciated.
     
  2. canucksfan88 macrumors 6502a

    canucksfan88

    Joined:
    Oct 28, 2007
    #2
    i installed yosemite yesterday on a usb...took it out and couldn't boot either.

    the only thing that came up was: yosemite installer and 10.9 recovery

    what i did was start the 10.9 recovery and then when that loaded, went apple icon (menu bar), restart with MacintoshHD.

    i was able to boot to mavericks after.

    hope that helps
     
  3. MacDawg macrumors P6

    MacDawg

    Joined:
    Mar 20, 2004
    Location:
    "Between the Hedges"
    #3
    I find it unbelievable that this still happens...

    Check out this thread and see if it helps
     
  4. tliede20 macrumors regular

    tliede20

    Joined:
    Nov 19, 2013
    Location:
    Los Angeles, CA
    #4
    Had this problem!

    All you have to do really is go into recovery partition (10.9 recovery), disk utility and choose your boot; make Mavericks or whichever partition you main and this SHOULD fix that problem!
     
  5. Visionblue thread starter macrumors member

    Joined:
    Jun 16, 2013
    #5
    Thank You. That worked like a charm. Lesson of the day: BACK UP, BACK UP, BACK UP!!
     
  6. tliede20 macrumors regular

    tliede20

    Joined:
    Nov 19, 2013
    Location:
    Los Angeles, CA
    #6

    Yes, do it now! :p I totally freaked because mine was on my work computer (bad idea for a main device) ... but thankfully while checking Disk Utility I could see my data remained untouched so I knew the partition was there just wasn't sure how to access it initially. :) Let me know if you are able to boot back and forth successfully now :)
     
  7. Visionblue thread starter macrumors member

    Joined:
    Jun 16, 2013
    #7
    Yes. Oddly enough it seems to have fixed the problem. Now when I boot from the startup disk screen I get the option to boot from "Crucial m500" which is my daily driver.
     

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