This happened to my daughter, a huge storm was coming and she was shutting down 
her Mac, BUT pulled the electrical plug before it had time to write the files 
that it has to prior to shutting down.  The disk would then never restart, I 
couldn't get anything to work.   We took it to Mac Authority and they fixed it 
with no loss of data.  Don't know what they did.  If they can't get to it then 
the Apple Store should also be able to help.

John


On Aug 3, 2010, at 9:30 PM, Bill Holt wrote:

> Try mounting and repairing it with the version of Disk Utility that came with 
> your system.  This doesn't always work, but often enough that it's worth a 
> try.  If DU doesn't do it, the you may want to acquire Drive Genius, which is 
> more likely to work.
> 
> 
> On Aug 2, 2010, at 5:45 PM, Nora Probasco wrote:
> 
>> I was in the middle of rebuilding the directory on my back-up hard drive 
>> with Diskwarrior when the power went off. Now when I turn on the computer it 
>> does not show this hard drive. Is there anyway to bring it back up or is it 
>> a goner?
>> 
>> Nora
>> 
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