USE MASTER
GO

sp_dropserver OldMachineName        -- Old Machine Name
GO

sp_addserver NewMachineName, LOCAL  -- New Machine Name
GO
--allow updates to system catalogs
exec sp_configure 'allow updates', 1
reconfigure with override

--update sysjobs
USE msdb
GO

update sysjobs set originating_server = 'OldMachineName'        -- Old Machine Name
where originating_server = 'NewMachineName'                     -- New Machine Name

--disallow updates to system catalogs
exec sp_configure 'allow updates', 0
reconfigure with override
GO