invisibleloop

Q: Failed yosemite install due to file permission errors. Now can't exit the installer.

I have tried to install Yosemite on iMac but the install failed due to file permission errors. I can't repair that disk as the option is greyed out. Options I have tried.

 

Safe boot. Loader bar stops at 50% after a few hours and never gets any further.

 

Recover mode: All options to repair are greyed out. Can't even erase the hard drive because it can't unmount the disk. Can't recover a backup from the time machine.

 

Start up manager: Only gives me the option to start using the installer.

 

Reset PRAM: Did this just incase... just get a black screen then goes to recovery tools

 

I also can't change the start up disk to the macintosh HD.

 

So I am now stuck. I can't seem to be able to do anything. If anyone understands my issue then I would love to hear from you.

 

Thanks

 

Andy

iMac (27-inch Mid 2010), null

Posted on Jan 1, 2015 8:14 AM

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Q: Failed yosemite install due to file permission errors. Now can't exit the installer.

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  • by invisibleloop,

    invisibleloop invisibleloop Jan 3, 2015 1:14 PM in response to david.lski
    Level 1 (0 points)
    Jan 3, 2015 1:14 PM in response to david.lski

    david.lski wrote:

     

    No, he can't. Look at the original post, then look at the article you linked. His computer is too old, the firmware doesn't boot to Internet Recovery. The option to use the original install discs, or another bootable USB are the options to shoot for.

     

    I managed to install Yosemite on to a 32gb flash drive (I had to partition with GUID option). This took forever (several hours) and the progress bar at the end of the process got stuck half way. After a restart I was able to boot into recover mode and erase the macintosh HD disk. I could then update to Yosemite and then migrate my time machine backup on to this mac. Everything is working perfectly. Many thanks for your solution!

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