I have done that already and had the same problem with both disks. I am assuming that 2 brand new hard drives would not both be bad right out of the box. Otherwise, I am extremely unlucky.
I see this on my motherboard's detail page: 4 x SATA 3Gb/s connectors (SATAII0, SATAII1, SATAII4, SATAII5) supporting up to 4 SATA 3Gb/s devices
Could it be because my hard drive is 6Gb/s??