I have a Dell 2850 with 6 drives (2 146gb raid 1, 4 73gb raid 5). All the drives show up in the raid utility and appear to be working fine...the correct amount of drive space is showing in Windows. However, the green lights next to each drive are all lit up except for drive 2. Sometimes it will flicker when there's activity, but the one light will not remain solid like all the rest. I replaced the drive and the same thing happens. I bought this machine off ebay and am concerned something may be defective.Any ideas?