![]() I will now reboot my iMac in Recovery Disk mode and re-install Mavericks on the MacMini. When I then fired up Disk Utility there was my disk - newly erased. If this window shows multiple user accounts, click the Set Password button next. At the Reset Password window, enter your new password information, then click Next. ![]() Enter a new administrator password, verify it, and fill in the Hint field so that you’ll get a memory trigger the next time you forget. ![]() Enter your Apple ID and its password, then click Reset Password to proceed. Reset Apple Mac OS X Root or admin password using Apple ID. To exit without resetting your password, choose Apple menu > Restart. Click the arrow icon to open the Reset Password dialog. If you see an Activation Lock window, enter your Apple ID email and password, then click Next. If you need to connect to Wi-Fi, move your pointer to the top of the screen and use the Wi-Fi menu to connect. In the left-hand pane, select the administrator account whose password needs to be reset. At the Reset Password window, click Deactivate Mac, then click Deactivate to confirm. Click the lock icon in the bottom left corner of the preference pane and enter your administrator password. Yes, you can log in without a password if you have Automatic Login enabled on your Mac: go to System Preferences > Users & Groups. Launch System Preferences, and select the Users & Groups preference pane. In my case it said The Core Storage Logical Volume Group UUID is 48AE3F70-916B-4BEB-AF63-0C2423E1481EĮrror: -69783: Unable to delete the CoreStorage Logical Volume Group Log in to a second administrator account. ![]() % diskutil cs delete XXXXXXXXXXXXXXXXXXXXXXXXXXXX <- put the Logical Volume Group ID in place of the Xs % diskutil cs list to get the the Logical Volume Group ID When off, proceed and press the Power button and hold the Control + R keys together, until the Apple logo appears, or you see the spinning globe icon. So, not caring about the data on that MacMini (it's just my TV server, nothing that cant be reinstalled and all the actual data is on an external drive) I've booted it in target disk mode (hold down t when you start it up and connect it via FireWire to another Mac) then fire up your Terminal. Having acquired any of these two, follow the following steps to reset a MacBook or any Mac computer on macOS 10.15 1. The HD in my MacMini has become corrupted and my only option is to erase it, but, in a fit of security consciousness, I encrypted it with FileVault and so Disk Utility won't erase it at all.
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