Sep 01, 2018 How to install Mac OS X YOSEMITE ISO. Since, we have been through the technical properties, here is an easy way to install it on your system: Download the OS X 10.10 ISO/DMG files. Convert the DMG files to ISO files. Now burn the ISO files in bootable DVD. Now you have the boot disk.
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I’m sorry to hear about the issue you are having with what I imagine you expected to be a straightforward install; that’s always frustrating. I’m sure we can help you out, but before we dive in it may be good to establish what we are working with:
1. Were you able to successfully copy your files to the external hard drive as you noted? Do you have any other full or incremental backups of your system from prior to the install, like in Time Machine?
2. What are you seeing when you try to reinstall from Recovery? Is it giving you an error, or is it just hanging/failing? If you are seeing an error, what does it say specifically?
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3. Similarly, what are you seeing when you try to verify/repair the disk? Is it saying that the disk is fine, is it finding repairable errors, or is it failing because it cannot repair the disk?
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Again, I’m sorry to hear that this happened, but we should be able to get you pointed on the right track.
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Oct 1, 2015 3:01 PM