danielb@corporate:/etc/postgresql/8.1/main$ sudo /etc/init.d/postgresql-8.1 start
 * Starting PostgreSQL 8.1 database server                                                                     * The PostgreSQL server failed to start. Please check the log output:
LOG:  could not load root certificate file "root.crt": No SSL error reported
DETAIL:  Will not verify client certificates.
LOG:  database system was shut down at 2007-01-30 10:02:23 CST
LOG:  invalid magic number 2E32 in log file 0, segment 75, offset 10625024
LOG:  invalid primary checkpoint record
LOG:  invalid magic number 2E32 in log file 0, segment 75, offset 10625024
LOG:  invalid secondary checkpoint record
PANIC:  could not locate a valid checkpoint record
LOG:  startup process (PID 14123) was terminated by signal 6
LOG:  aborting startup due to startup process failure