In the case of disaster recovery, if rebuilding the master database is unsuccessful, you can rebuild the SQL Server by reinstalling each SQL Server instance.
Before You Begin
Uninstall the existing SQL Server instances.
Install the SQL Server instances by using the same installation paths and configuration settings as the previous installation.
Paths and instance name information of the original installation can be viewed by browsing the backup data from the CommCell Browser.
At a command prompt, run Services.msc
In the Services window, right-click each SQL Server instance and select Start.