PowerEdge R740 || The storage BP1 SAS A0 cable is not connected, or is improperly connected.

Narayanasamy E,

I would start with powering down the server and then reseating both ends of the SAS cables on the backplane, then power back up and see if the issue is resolved. If it isn't then you may want to try a known good cable or backplane from another R740, if you have one. 

Let me know if this helps.