We are performing the downgrade activity from SQL server 2008 R2 Enterprise to Standard.
After the uninstall and re-install the standard version, (once the saved system databases were copied to the new installation location), we are unable to start the SQL service which was running under local system account:
Error from event viewer:
Error 2(The system cannot find the file specified.) occurred while opening file 'C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\master.mdf' to obtain configuration information at startup. An invalid startup option might have caused the error. Verify your startup options, and correct or remove them if necessary.
Earlier before downgrade these system databases were on D:\, but i believe that may not be the cause because we have not witnesses this earlier during the previous times when we downgraded.
Please suggest what possibly could have gone wrong here: