Next, you'll see a list of all the HDs currently attached to your Mac. Click on the last one (Disk Utility) and then select Continue. In this are four options: Restore from Time Machine Backup, Reinstall macOS, Get Help Online and Disk Utility. Release the keys and shortly afterward you should see the macOS Utilities window appear. Then press the power button and immediately hold down the Control and R keys until you see the Apple logo or spinning globe icon. To further protect your Mac, you should set an Open Firmware password using Apple’s utility.First you'll need to turn off your iMac.
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