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  1. #1

    Seventh's Avatar
    Member Since
    Oct 10, 2009
    Location
    Boston, MA
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    48
    Specs:
    27" iMac, 17" MBP, Mini x2
    Question iMac won't boot from OS Install CD for disk repair
    Hi folks,

    After having my iMac a few months, I enabled (and subsequently disabled) FileVault and things have never been the same. I verified my disk using DU, and it said that I need to boot from a CD and run a repair on the volume.

    I'm trying to boot from the original install/restore CD that came with the iMac - I hold option at startup, select the CD, the apple logo changes to a halt sign, and then the machine boots up into my regular OS - not the CD.

    Is there another way to repair the volume? What am I doing wrong, and how can I boot to the CD so that I can run a repair? I picked up a MBP recently as well and tried booting to the OS CD that came with that as well and get the same result - a halt sign and the iMac just boots to the hard drive.

    Any insight would very much be appreciated. FV made my system all sorts of unstable, and I'm constantly getting Finder crashes and random App hangs.

    Thanks much!

  2. #2

    Chef_eam's Avatar
    Member Since
    Dec 12, 2009
    Location
    Midland,Tx
    Posts
    357
    Specs:
    iMac 27" 2.66GHz i5, 1TB HDD, 12GB RAM, OS X 10.7.3, iPod Classic 160GB,iPad 1 64GB Wi-fi, iPhone 4S
    Hold down the C key when booting to boot from the install disk

  3. #3

    blackmac11's Avatar
    Member Since
    Jan 16, 2009
    Location
    Tecumseh, Ontario
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    498
    Specs:
    iMac 20" 2.4 GHz Dual Core 3GB Ram 320GB Hard Drive 10.6.2 :: Ipod Touch 8 GB :: Beastly Gaming PC
    I'll say it 1000 times - as will everyone else - FireVault is a vary bad idea for personal computers. It seems you learned this the hard way though...

    l
    Iíll keep it short and sweet ó Family. Religion. Friendship. These are the three demons you must slay if you wish to succeed in business. -Monty Burns

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
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    22,254
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Pop in the original install disc, not the one that came with the MBP as it will NEVER boot. Reboot and immediately after the chimes hold down the 'C" key and not the Option key. Hopefully you will get the Installer page, go to Utilities and run Repair Disk. Hopefully that will fix your problem, if not you will be in for a reformat and clean install so trust you have everything backed up to an external drive?

  5. #5

    Seventh's Avatar
    Member Since
    Oct 10, 2009
    Location
    Boston, MA
    Posts
    48
    Specs:
    27" iMac, 17" MBP, Mini x2
    Quote Originally Posted by blackmac11 View Post
    I'll say it 1000 times - as will everyone else - FireVault is a vary bad idea for personal computers. It seems you learned this the hard way though...
    Yep, definitely learned this the hard way. It didn't help that my iTunes library was in my Documents folder and was around ~250GB either, but we live and we learn. I used it on my MBP as well (both at the same time) and spent the next day unencrypting everything. Shame, because it seems like such a good idea if it wasn't so dodgy.

    Thanks for the input all - turns out it was a matter of patience on my end. The ex-Windows guy in me was used to hitting the key once. Holding it down through the entire boot cycle did the trick, and after a repair my Finder/app woes have (so far) been non-existant.

    Cheers!

  6. #6


    Member Since
    Dec 13, 2011
    Posts
    5
    Hey, I'm trying to run repair from DVD also and can't boot from DVD with "C".

    Is it the same thing to hold "Option" while booting.. .. and select the OSX DVD from the grey screen there?

    Will that bring my to Disk utility to Repair the disk?

  7. #7

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,097
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Yes, hold down the OPTION key as soon as you hear the chime. If the disk is OK and your optical drive is working, you should see the disk as a boot selection. Once it boots to the disk, click on the top menu "Utilities" and from there select "Disk Utility".

  8. #8


    Member Since
    Dec 13, 2011
    Posts
    5
    Hmm it gives me the option. Clicked it. It gives me the pinwheel loading kind of thing.. but not the rainbow one.. you know. .. the circle bar one. lol. just checks the disk in the drive. over ten minutes.. How long should it take?

  9. #9

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,254
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Ten minutes would be fine and trust you got a message in green indicating the drive is okay?
    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!

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