Dispatcher not starting

Hi Guys,

I'm facing an issue.

I have restored a system by db restoring.

Now the SAP is getting up properly but dispatcher is not starting.

dpmon=>sapparam: SAPSYSTEMNAME neither in Profile nor in Commandline

Already ran cleanipc and ipcrm -s but no luck. Everything seems to be all right but dispatcher is not working.

System details -

OS -Linux

DB -Oracle 11.2

SAP -7.20 (NW)

Please Guide.