I got couple of PowerEdge 1950, trying to install Windows Server 2003 / 2008
They came with no HDD in them, and i don't have any SAS, so i insreted SATA (Tried with both Seagate 1TB, WD 500GB only) on nr1 slot

But OS can't find any hard drives,

I went on BIOS, disabled / enabled RAID with no help, on SATA Mode i can only pick ATA Mode / OFF no more, tried both options,

still OS can't find any hard drives, i went into "Perc 5/i Integrated Bios configuration Utility" Physical Disks and there is my HDD,

Vendor ATA it says, i even made Virtual Disk with RAID0 (Couldn't select any other RAID level) Init it, still OS can't find any hard drives.

What am i missing here?

I would really appreciate your help,

Thanks in advance!