After upgrading SQL Server 2005 to SP3 I had difficulty bringing SQL server back online. The error message indicated a problem when opening 'master.mdf' or a problem with start up parameters. The parameters looked ok and I did not want to reinstall the SQL server.... Online research pointed to potential master database corruption, however the problem turned out to be a simple one -there was an extra space infront the start up parameters in the Configuration Manager. SQL server started up after the extra space was removed.
Error occurred while opening file '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.