Now we entered this in the FAQ: 
Q. I had a [Power Outage|Computer Failure|Spilled coffee on computer|etc], how can I resume the recon-all?

thanks Doug.

cheers
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Pedro Paulo de M. Oliveira Junior
Diretor de Operações
Netfilter & SpeedComm Telecom
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On Thu, Jun 24, 2010 at 11:59, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:
You can try

recon-all -make all -s subject

Also, depending on your version, there might be a file in the scripts
directory called "IsRunning". You should delete this if it is there.