dell poweredge 2950 sata hard drive

Here is my problem, I have a older 2950 and I can't get it to see any hard drives. dell inspiron g5 5000 I had first put in a 750GB SATA WD drive and noting Did the Shift+R to get into the raid controller to set up a VD and no drive found Then I ordered a new 73GB SAS drive and did the same, no drive found I am getting the "the battery hardware is missing or