See if you have source entries in node_name columns of FND_CONCURRENT_QUEUES table
update FND_CONCURRENT_QUEUES set node_name='target node' where node_name='source node'
Start the Standard manager and verify the table entrie with below query
select * from FND_CONCURRENT_QUEUES
Still you have issue please work on below notes
E-Business Suite Concurrent Processing - After Cloning All The Concurrent Managers Do Not Start For The Cloned Instance (Doc ID 555081.1)
Thanks, I have been able to resolve that. I went to define manager form in system administrator responsibility, search for standard manager and change the node name from the original machine to the new machine. I reduced the no of processes from 20 to 5 and was able to restart the manager. Everything is fine now.