Start up error

Hello Sir,
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I have installed postgresql DB on my Linux server.
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When I am trying to stop and start the DB, below error is reported in
postgresql start up log file.
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FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 25372) running in data directory
"/var/lib/pgsql/data"?
FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 25372) running in data directory
"/var/lib/pgsql/data"?
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I have deleted the file postmaster.pid in the directory
/var/lib/pgsql/data for number of times and restarted the postgresql
service, but I am still not able to restart the server and the same
error is repeating again.
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Could you please suggest on this as the applications are completely
inaccessible due to this error.
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Thanks&Regards,
-Jawad.
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