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It makes it the main boot disk so it will continue to boot from that disk. It's equivalent to the Startup Disk preference pane in System Preferences, only done in a different place so you don't have to boot into OS X.


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This problem was later diagnosed by an Apple store as the processor being blown, which I said was slightly odd but they weren't willing to repair it.


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I had a similar thing happen to my old Macbook. I discharged the battery all the way down and then couldn't recharge it for about two days. When I finally could charge it, it wouldn't charge or turn on. It turned out to be the battery. You can probably get a replacement battery from Apple (if it turns out to be the battery), but I found cheaper options on ...



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