My computer won’t start up. It takes me to the MacOS utilities. I went to the disk utility and ran the first aid which locked the system disk. Now I can’t get it unlocked. On disk utility, my erase is grayed out.
Mac mini, OS X Yosemite (10.10.4)
That’s the recovery partition or Apple’s Internet Recovery system; it isn’t possible to unlock it.
If your internal drive shows up in the Installer, specify it.
If your internal drive shows up in the Disk Utility, mount, repair, or erase it as desired.
If your internal drive doesn’t show up in either location, it’s either dead or not properly connected.
(157942)
That’s the recovery partition or Apple’s Internet Recovery system; it isn’t possible to unlock it.
If your internal drive shows up in the Installer, specify it.
If your internal drive shows up in the Disk Utility, mount, repair, or erase it as desired.
If your internal drive doesn’t show up in either location, it’s either dead or not properly connected.
(157942)
I do not have a clear picture of the state of you machine.
How old is your mac? Harddrives start goin' bad at three to five years. You could get an external drive and install macOS on it.
Do you have backup? if no, and you need to recover your data. See this link:
backing up from the command line via single user mode.
https://discussions.apple.com/thread/8101803?answerId=32357328022#32357328022
Or, you need to pull the drive out and place in external drive enclosure to recover the data.
Your post has the machine stopping in the middle of a boot.
-1- Safe boot may work. power off. hold down option key. power on. wait to see icon.
-2- single user mode may work power off. hold down command + s key. power on. wait to see icon.
-3- command + r should work. power off. hold down command + r key. power on. wait to see icon.
-4- option + command + r should work. power off. hold down option + command + r key. power on. wait to see icon.
try in this order report the results for each.
How to re-install MacOS
https://support.apple.com/en-us/HT204904
Boot to Startup Manager
Power off your machine. Hold down the option/alt key. Power on your machine. Continue holding down the option/alt key until you see an icon. Click on the start drive you wish to boot. Click on the right arrow icon or press the return key.
How do I Unlock the OS X base system disk?
