Dell PowerEdge R520 - No hard disk found

Hi,

I got a Dell R520 with the following specs

2x processors

32 GB Memory

8x 2 GB NL SAS (RAID 5)

PERC H710

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I set up RAID 5 with all 8x Disks then I restarted the servers and loaded the Windows 2008 R2 DVD installer.

Tried installing Windows 2008 R2 STD.

I could not find any hard disk / virtual disks to install the OS ?

Hope someone can point me to the right direction.

Thanks,

Paul