Show 6 more comments. Click on disk utility and erase the hdd from internal only once done go back and go to reinstall Osx sierra.
Ryan Turnbull. I ended up installing High Serria on a thumb drive, rebooting the mac holding down command, and selected the thumb drive to boot from. Exit disc utility and installed High Serria. It's installing now.
I'll message again if there are any problems. January 16 by kylem Ozcelik atalay atalay. Select a Language: Help Translate iFixit. Back Answers Index. Martina tindc Rep: So I got a second hand macbook pro.
Restore Mac with the help of Recovery HD
I tried to reinstall macos, but it says that its locked. View the answer I have this problem too Subscribed to new answers. Is this a good question? Yes No. Voted Undo. Score 6.
How to Unlock Recovery HD on Mac OS X Lion
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Score 2. Most Helpful Answer. S W avanteguarde Rep: The Recovery component appears to be really important as it may help a user to reinstall the OS, repair the hard drive or restore the OS after a backup. The recovery mode on Mac shows a desktop with the menu bar of an OS X, as well as the window of OS X utilities where you can find such options as reinstalling the OS, repairing the HD or restoring the operating system after a backup , as mentioned above.
Next, you need to choose a respective option from the utilities menu or window. Time Machine can back up one day, one week or a whole month.
Can’t reinstall MacOs because disk is locked (2nd hand MacBook)
The issue with it is that once the backup drive is filled, the oldest of the backups are gradually deleted to free up more space for the latest backups. Installing or uninstalling an operating system on your Mac is another powerful feature offered by Recovery HD. It lets you download any version of the OS X via the Internet.
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Otherwise, you might find yourself in an urgent need of help with writing papers if your current assignment has been damaged, especially when the deadline is looming. In some cases, the Recovery HD may be locked.
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