Help please! I have iMac 2011, get it last year from craigslist with El Capitan on that moment. Upgraded to Sierra recently. Then decided to erase disk and reinstall. But now I cannot because it shows that disk is locked.
Here are details.
1. I restarted iMac
2. No keys need to be pressed/hold - it goes directly to macOS Utilities with a 4 options: Restore from Time Machine Backup (I don't have backup), Reinstall macOS, Get Help Online, Disk Utility
3. I select Reinstall macOS, then Continue
4. Opens window macOS Sierra, where I click Continue
5. After clicking Agree with license agreement it goes to next window
6. Here under macOS Sierra I see label "Select the disk where you want to install macOS" and 2 disk icons: OS X Base System (499 GB) and Recovery
HD (650 MB). BTW, sometimes after restarting second disk Recovery HD doesn't appear here
7. When click on OS X Base System disk icon, it shows warning :"This disk is locked."
8. If click on next icon with Recovery HD, it just shows what arrow with no label
9. Anyway, Install -> button never gets enabled
10. The only way too get out of this installation screen is to restart iMac
11. After restarting and getting macOS Utilities, I go to Disk Utility
12. Screen shows one Internal disk: ST3.....Media, when expand, shows disk icon OS X Base System
13. If OS X Base System is selected, only first tab "First Aid" is enabled on Disk Utility, rest - Partition, Erase, Restore Unmount - are disabled. If running first aid, no errors shown up
14. If disk ST3..... Media is selected, it enables also second tab Partition
15 . From here you cannot click add(+) because it's disabled..
Any help will be gratefully appreciated
Here are details.
1. I restarted iMac
2. No keys need to be pressed/hold - it goes directly to macOS Utilities with a 4 options: Restore from Time Machine Backup (I don't have backup), Reinstall macOS, Get Help Online, Disk Utility
3. I select Reinstall macOS, then Continue
4. Opens window macOS Sierra, where I click Continue
5. After clicking Agree with license agreement it goes to next window
6. Here under macOS Sierra I see label "Select the disk where you want to install macOS" and 2 disk icons: OS X Base System (499 GB) and Recovery
HD (650 MB). BTW, sometimes after restarting second disk Recovery HD doesn't appear here
7. When click on OS X Base System disk icon, it shows warning :"This disk is locked."
8. If click on next icon with Recovery HD, it just shows what arrow with no label
9. Anyway, Install -> button never gets enabled
10. The only way too get out of this installation screen is to restart iMac
11. After restarting and getting macOS Utilities, I go to Disk Utility
12. Screen shows one Internal disk: ST3.....Media, when expand, shows disk icon OS X Base System
13. If OS X Base System is selected, only first tab "First Aid" is enabled on Disk Utility, rest - Partition, Erase, Restore Unmount - are disabled. If running first aid, no errors shown up
14. If disk ST3..... Media is selected, it enables also second tab Partition
15 . From here you cannot click add(+) because it's disabled..
Any help will be gratefully appreciated
