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  1. #1


    Member Since
    Jul 13, 2010
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    36
    Can't boot from another startup disk since OSX Lion install
    I hold c, or option when it starts up, or try to startup from another disk through system preferences.

    I am no longer given the option to startup from any other disk other than my main internal hard drive, and the recovery drive.

    I have a clone drive and a diskwarrior drive I would like to access. Does anyone know why this might be?

    thanks in advance!!
    Mac OSX Lion 10.7 | 2.66Ghz Intel Core 2 Duo | 4 GB 800 Mhz DDR2 SDRAM |

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
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    47,163
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    The installation of Lion should not have changed being able to boot from an external hard drive. Are you able to boot from a DVD? Also, what kind of Mac are you trying to boot, year and model?

  3. #3


    Member Since
    Jul 13, 2010
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    36
    Quote Originally Posted by chscag View Post
    The installation of Lion should not have changed being able to boot from an external hard drive. Are you able to boot from a DVD? Also, what kind of Mac are you trying to boot, year and model?
    Yes, I can boot from the OSX Leopard DVD. When I go to System Preferences>Startup Disk, there is the option to startup from the disk which I am trying to use, although it continues only to start up from my main internal HD reguardless.

    However, during startup when I hold down the Option key, the disks that come up are only the main internal and the recovery drive. The other ones I have connected, which appear in system preferences, do not even show up.
    Mac OSX Lion 10.7 | 2.66Ghz Intel Core 2 Duo | 4 GB 800 Mhz DDR2 SDRAM |

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
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    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    However, during startup when I hold down the Option key, the disks that come up are only the main internal and the recovery drive. The other ones I have connected, which appear in system preferences, do not even show up.
    Are you sure the external hard drives are in fact bootable? The clone external hard drive is a clone of which operating system? Not sure about the Disk Warrior boot disk - it may no longer work correctly since you upgraded to Lion. I know that my Data Rescue 3 boot disk likewise no longer works for the same reason.

  5. #5


    Member Since
    Jul 13, 2010
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    36
    Quote Originally Posted by chscag View Post
    Are you sure the external hard drives are in fact bootable? The clone external hard drive is a clone of which operating system? Not sure about the Disk Warrior boot disk - it may no longer work correctly since you upgraded to Lion. I know that my Data Rescue 3 boot disk likewise no longer works for the same reason.
    yes, it worked before I installed OSX Lion. I am posting this because for some reason, when i restarted my computer just a second ago, it booted from the cloned drive because of how I had previously selected the startup disk in system preferences to be the clone drive.

    I don't know why it's working now and wasn't working before. I will post again if the problem comes back up.

    thank you for your help anyway!!
    Mac OSX Lion 10.7 | 2.66Ghz Intel Core 2 Duo | 4 GB 800 Mhz DDR2 SDRAM |

  6. #6


    Member Since
    Aug 01, 2011
    Posts
    1
    Me, too!
    The exact same thing has happened to me, but it hasn't resolved itself. Help!

  7. #7

    Slydude's Avatar
    Member Since
    Nov 16, 2009
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    North Louisiana, USA
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    9,243
    Specs:
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    I think I had this happen on my Mac Pro which has one drive with Lion and one drive with Snow Leopard. That drive was a clone of my MacBook Pro. The first time I went to the startup preference pane and tried to boot SL it did not work. Went back and re-selected SL and it worked.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  8. #8

    Nighthawk4's Avatar
    Member Since
    Jul 14, 2008
    Location
    UK
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    744
    Specs:
    iMac 2.66 GHz 20", iPad Mini2 32GB, iPhone6 64GB, Watch Sport 42mm Black, iPad Air 2 128GB
    I use SuperDuper! and have a number of bootable copies of both Lion and SL on external USB drives. All of these show up in the list when I boot with the Option key pressed, plus the Recovery partition and the DVD if it is in the drive. This has not changed since I installed Lion. Also applies both on my iMac and the MacMini.

  9. #9


    Member Since
    Jul 14, 2007
    Posts
    2
    I am having exactly the same problem, and I've put days into making sure it's really happening.

    Yes it is.

    Since installing lion, the "hold C at startup to boot from CD" no longer works on my macbook pro mid 2009. I can not boot from my original install disks, I can not boot from the Leopard DVD, I can not boot from a bootable USB of Leopard, or a bootable USB copy for my Original Install disks. I can't even install Leopard from clicking in OSX Lion on the DVD drive, and then going through the installation instructions for Leopard. After it says it will restart the computer, it hangs and never installs.

    Then when pressing the Option key at startup (which brings you into the choose the boot drive- where you can see the lion recovery partition), the DVD drive is not visible. HOWEVER, if I start up the machine with the lion disk on an external disk and hold the Option key at startup, then I see the external disk- and after a moment I see the DVD drive with the leopard install DVD. However if I click on it to instal, the system freezes.


    I think that Lion does indeed change your computers basic firmware in someway that prevents you from booting from CD.

    So anyone have any ideas about that?

  10. #10

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
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    47,163
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    I think that Lion does indeed change your computers basic firmware in someway that prevents you from booting from CD.
    Lion can not change the firmware. Apple does not include firmware updates along with an operating system update. Besides, each machine model has different firmware.

    Try resetting your NVRAM and then see if you can boot from the optical drive. I have no problem booting from DVD on both of my Macs regardless of whether it's Snow Leopard or Lion.

  11. #11

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
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    21,225
    Specs:
    27" 5K iMac, 3.3GHz, 256GB Flash Storge, 16GB memory and OS X.11.3.
    And using Lion has had no effect on DiskWarrior, booting from the DVD holding down 'C' or selecting from within Startup Disk.

    Both ways of booting are just fine. Wonder is this is a problem within the optical drive? Also if you use an OWC Mercury Extreme SSD, do not use the TRIM patch to activate TRIM as this can cause this very problem.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  12. #12


    Member Since
    Oct 17, 2011
    Posts
    1
    I have to option to boot from my SL drive, but it stops on the blue apple screen
    Similar problem:

    after holding opt on startup, I have to option to boot from my SL drive, but it stops on the blue apple screen and doesn't load any farther. It has only started since installing Lion though... any Ideas??

  13. #13


    Member Since
    Oct 19, 2011
    Posts
    1
    Same problem here.

    My Mac really started bogging down after installing Lion. Mail rarely works. Tried starting up from my snow leopard DVD, but it would only get to the starry screen and then stop. Tried starting up from a thumb drive with Lion on it, and it will get to the gray screen and stop.

    Im now in the process of trying a clean install...

  14. #14


    Member Since
    Dec 30, 2011
    Posts
    1
    Same problem for me too. The Macbook won't on any of my SL install disks, which are working on other Macbooks, but only on the Lion install disk.

    It does nothing to erase the hd where Lion is installed...

    I really don't know what I can do now...

  15. #15


    Member Since
    Feb 07, 2012
    Posts
    1
    Lion won't read Snow Leopard Install DVD
    I've been reading around and it really seems as though the Late 09 iMacs can have this issue as well. My issue is that the iMac won't even acknowledge there's a disk in the superdrive. I was at the Genius Bar recently for another repair and asked about it. My computer would not read my 10.6.2 Leopard disk. The Genius took the disk to other machines around the store and they read it fine. He then put in a blank disk in my machine, it read it fine. He then put in a 10.6.4 leopard disk, my machine read it. So here I am with every imaginable issue with Lion, bad wifi disconnects, slow internet when connected, sound issues with Logic / Garageband. And I cannot restore anything to Leopard. So I'm going to do it my way. I'm going to get a 10.6.8 ISO and burn it to a DVD and install from that. Lion has been the worst experience I've ever had with an OS.

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