New answers tagged startup
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.
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.
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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