Click on Utilities in the menu bar at the top of your screen to access Disk Utility or click on System Information if you want to look up information about your system’s hardware configuration instead of erasing it completely.
After a few seconds, you’ll see an Apple logo on your screen and then you will be greeted by a gray screen with multiple language options and buttons for Utilities, System Information, Disk Utility, Network Utility, and Terminal.Shut down your iMac by holding down the power button until you see a slider with options to shut down, restart, or put it to sleep.Press the power button to turn the iMac off.Type in your username and password (if you have one set) when prompted to log in with administrator rights, then enjoy using your newly reset iMac!.You will hear another startup tone here, which means that booting is complete and your computer is now reset to factory settings! Let go of Command-Option-P-R for now, but keep holding down Option and R until your Mac restarts again. Wait until you hear a second startup tone (about five seconds long).
If you see a spinning disc cursor instead, try holding down Shift as well, then let go of all keys when you see the Apple logo appear on the screen.
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