TNS12541 No listener.

Hi,
I am getting the error "TNS:12541 No listener" when I'm logging in to the oracle.I'm able to log in properly, but when I have added one new database manually then I am facing this issue. TNS listener got stopped automatically. When I start the service it is giving me the error ""Error 1067: The process terminated unexpectedly".
How can I solve the issue.Can anyone please guide me in step by step as I am a tester and I dont know deep in oracle.I have gone through many forums and I am unable to solve the issue.Many are telling that start the listener.How can we do that? And also I have checked the dbname,sid and port number in tnsnames.ora all are correct.
My work has been sopped with this issue.Can someone guide me quickly.
Thanks in advance,
Regards,
Sudheer

Hey I have solved the solution. As I have added new database manually, I have copied a listener file in to that folder. Today morning I have deleted the file from that folder and tried to open the data base. It gave me another error saying that oracle not valid. I have logged in to sys/sys as sysdba and dont shutdown and started it again. Then it is working fine
Thanks a lot for your replies.
Regards,
Sudheer

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