More for me than you. If a cluster, make sure the resource is offline or it will error.
F:\en_sql_server_2012_enterprise_edition_x86_x64_dvd_813294\Setup.exe /QUIET /ACTION=REBUILDDATABASE /INSTANCENAME=InstanceName /SQLSYSADMINACCOUNTS=domain\User /SAPWD=P@55w0rd1 /SQLCOLLATION=SQL_Latin1_General_CP1_CI_AS
Sql Server Powershell 
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