There's a problem when I trying to install DSS v7 on a Dell R710 server. After I click agree conditions, there's an error message show me "No mediums found", and leave me 2 options "Reboot" and "Shutdown".

Is that mean no HD found on my server? What should I do next?

hardware list:

Dell Prec 6/i RAID controller
6*15K SAS HD(5HD RAID 5 configed, 1 global hot spare)

Thank you so much!!