Check your cabling by reading the manual again...start at age #7. The PERC H840 have also the cabling guide inside. The non-RAID HBA have green LEDs .... not sure if the H840 has also connection LEDs. After that enter the system setup again and create a RAID ... you can list the phys. Disks also.
Dear All,              I have a Dell 650xs server with 2 SAS card connecting to MD1420, and just wonder how do i configure the raid setting on MD1420 ? is it from the Dell 650xs bios ? or there is a software to do it ? any help would be appreicated    Keith 
Configure Dell MD1420 question