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Message: <blockquote data-quote="cwa107" data-source="post: 350147" data-attributes="member: 24098">I'm not sure as I've never done that before.  I believe the guy on the other forum was the one that was going to walk you through that procedure.  I'd imagine that you would attach the two, turn on the bad one, hold the option key down so that it doesn't try to boot up (leave it sitting at the select disk screen).  Then turn on the other (good machine), boot into OS X, open the Disk Utility and then format the other machine's hard disk.Obviously you'll need an install disc to put the operating system back on the machine once it's been successfully formatted.  Have you called Apple yet?</blockquote>