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Helpful answers
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Oct 3, 2015 7:54 AM in response to danielfromwhitmanby Dave Dicken,Here's another option I found:
Didn't help in my case but maybe it'll help someone else
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Nov 3, 2015 11:48 AM in response to danielfromwhitmanby hoopty-doo,I just encountered this issue with my old early 2011 MacBook Pro... The OS indicated the drive was fine upon ' verify disk.' But, it would not boot anymore.... Then, I got into the boot with command + r option to repair the OS. Upon trying to reinstall OS X Mountain Lion got the ' disk locked' message. This told me somehow the MBR ( master boot record / equiv) was messed up; possibly bad instructions, or even more likely, hard drive going south.
So, I took someone's advice in this thread, I pulled the drive out of the laptop, hooked it up to an enclosure, connected it to my new MacBook Pro, and the OS X Yosemite tells me immediately, ' bad hard drive, cannot fix, will run, but may die soon. Back up ASAP.' So, I'm now backing up...
Thanks to this thread you all saved me a lot of time by trying to reinstall the OS, tinkering with settings and different boot modes... Instead of going any further with all that, I just yanked the drive and hooked it up to an enclosure and I'm getting my lost files back!!!! I"M HAPPY ( and I know where to go from here...!)
THANKS!
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Feb 4, 2016 6:08 PM in response to hoopty-dooby damien_iThink,I ran into this problem because I had no drives mounted. Go into utilities, disk utilities and check to ensure you have the drive/partition mounted that you want to use for the OS install.
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Sep 18, 2016 8:19 AM in response to chituhby Eric Root,You might want to consider starting a new discussion. Since this one is a couple of years old, less people are likely to look at it. A new post would be much more visible. You can link to this one.