How to Restart a Mac in Target Disk Mode

Log on to your computer with an administrator account.
Open System Preferences by clicking on the icon in the dock.
Go to the 'Startup Disk' control panel under the 'System' category.
Click on the 'Target Disk Mode' button and click 'Restart' to confirm your decision.
Connect your computer to another computer with a Firewire cable. When your computer restarts, it will enter target disk mode and will appear as an external hard drive on the second computer.
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