Invalid Checksum in Control File

We recently had a system failure and needed to rebuild a server. Our
database is stored in a storage array and after the rebuild my service
fails with pglog reporting:

FATAL: incorrect checksum in control file

I've read that the control file is saved in pg_clog however I have not
been able to find out how to recover from this error. We're running FC6
and Postgres 8.1.4. Any input would be greatly appreciated.

Thanks,
Chris

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