Hello Ravi,
The kernel
relno 7000
patchlevel 0
patchno 75
is quite old, isn't it? You should first update it.
Check in dev_wNN (e.g. dev_w0) what is the exact error wich prevents the work processes to start. In dev_disp you can see only that the processes were stopped one by one, but not the reason. This is what is documented in details in dev_wNN. This could be a memory, network, database connection error, etc...
Best regards,
Adam