To select a Wi-Fi network, use the Wi-Fi menu in the upper-right corner of the screen. You might be asked to select a Wi-Fi network or attach a network cable.When reconnecting to a Bluetooth keyboard, you're asked to choose a language. If the accessory doesn't connect within 30 seconds, turn the accessory off and back on. If it needs to reconnect to a Bluetooth accessory such as a keyboard or mouse, you might be asked to turn on the accessory. Your Mac restarts and shows a black screen or progress bar.Click Erase All Content & Settings to confirm that you want to proceed.
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If you're asked to sign out of Apple ID, enter your Apple ID password and click Continue.Click Continue to allow your settings, media, data, and the other listed items to be removed.Or click Continue to proceed without making a new backup. If you're asked to back up your Mac before resetting it, you can open Time Machine and back up to an external storage device.Enter the password you use to log in to your Mac, then click OK. Erase Assistant opens and asks you to sign in with your administrator credentials.From the System Preferences menu in the menu bar, choose Erase All Content and Settings.From the Apple menu in the corner of your screen, choose System Preferences.Otherwise, you'll see a message explaining that other volumes need to be erased before you can erase all content and settings on this Mac.
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