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I have a 2007 Macbook Pro and for nearly two years, the battery has been toast. In April, Apple replaced the logic board. Since the repair, whenever the power cable comes loose, the MBP shuts off as expected.

Before the repair, when the power cable was unplugged, the MBP simply shut off. Now, when I plug it back in and turn it on, it boots back up in the previous state, but has a white screen with loading bars at the bottom.

I haven't found anything related to this on the web. Is this related to the new logic board, or is there something else I should be concerned about? The MBP is running Leopard and is up to date.

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time to get a new battery :) maybe check out the nupower/newertech batteries at OWC. –  Robert S Ciaccio Aug 17 '10 at 19:58
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this is a great feature btw... when i got my mid2010 macbook pro it really surprised me that the machine was able to recover from running down the battery. All my programs were still there and I hadn't lost any work. –  Robert S Ciaccio Aug 17 '10 at 20:00
    
Yes, it is a great feature ! I have it in my MacBook Pro from 2011. @Steve, your replacement happened to be a luck one for you ! –  Nicolas Barbulesco Nov 1 '13 at 17:00
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2 Answers

up vote 7 down vote accepted

This feature is called Safe Sleep. Apple notebooks will keep the RAM contents alive (sleep in PC jargon), but write a copy to the disk (hibernate, in PC jargon) at the same time.

If the battery runs out while the computer is sleeping, when it wakes up, it needs to read the RAM contents from disk, and thus you get the progress bar you are seeing.

Apple doc about it is here

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This is so called "Hibernation" (my first met in windows). When battery dies, the OS dumps whole RAM into HDD (sort of swapping) so that no information is lost. When it's being booted back up, it loads the information back from HDD to RAM (hence you see the progress with those white bars).

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Apple's vernacular is Safe Sleep. –  Chealion Aug 17 '10 at 19:51
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