D: Start up to the Apple Diagnostics utility.If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery. Option-Command-P-R: Reset NVRAM or PRAM.If your Mac is using a firmware password, you're prompted to enter the password. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes.macOS Recovery installs different versions of macOS, depending on the key combination you use. If your Mac is using a firmware password, you're prompted to enter the password. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the internet. Command (⌘)-R: Start up from the built-in macOS Recovery system.Keep holding until the described behavior occurs.
The imaging process will take 15-30 minutes.To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. You will be asked for the admin username and password. Make sure that there are checkmarks next to “Erase Destination” and “Skip Checksum” (if they are there and available) and click on the “Restore” button.The new yellow icon is usually named Macintosh HD and is not to be confused with the grey Macintosh HD icon which may represent the disk of the “spare” Mac. In the Disk Utility window drag the hard disk of the Mac that needs to be imaged (the yellow icon) to the “Destination” field.In the field named “Source” click on the “Image” button and select the image.When you click on the “Restore” tab, the middle of the window will have a field where you can choose the image.In Disk Utility click on any of the disks listed there and then click on the “Restore” tab.When you can see the firewire logo, the hard disk of the Mac that needs to be imaged will appear on the Desktop of the “spare” Mac and in the Disk Utility window.Continue holding down this letter until you see the firewire logo on the screen of the Mac that needs to be imaged.Press the power button on the Mac that needs to be imaged and immediately press and hold the letter “T” on the keyboard of the Mac that needs to be imaged.Connect the Mac that needs to be imaged to a power outlet.Use a firewire cable to connect firewire port of the Mac that needs to be imaged to the firewire port of the “spare” Mac.
In the Utilities window double click on “Disk Utility”.From the “Go” menu at the very top select “Utilities”. The distribution team can help you copy this image onto the spare Mac. the image (resides on the mac server called bigcat).
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