Invalid checkpoint record

Just install Postgresql 7.1.2 last week, and import a lots
of database into it. It's been running fine until this
morning, when I try to startup postmaster, it shows

DEBUG: database system shutdown was interrupted at
2001-07-02 20:57:38 EDT
DEBUG: open(logfile 0 seg 20) failed: No such file or
directory
DEBUG: Invalid primary checkPoint record
DEBUG: open(logfile 0 seg 20) failed: No such file or
directory
DEBUG: Invalid secondary checkPoint record
FATAL 2: Unable to locate a valid CheckPoint record
/usr/local/pgsql/bin/postmaster: Startup proc 1288 exited
with status 512 - abort

Please help, I have a lot of data inside. Or anyway I can
retrive the data into text file or MySQL database format?

=====
GROWTH - The rung of a ladder was never meant to rest upon,
but only to hold your foot long enough to put the
other foot higher.

-anonymous

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