Could this be the cable you are looking for?
Hi ,I once replaced my odd with an additional hd  and recieved excellent feedback from this community in helping me do that  I had to purchase a new lead for this purpose but now want to get rid of the extra storage and get my optical drive running again. However....... I have misplaced the original cable so need to find a replacement.  It has mini 6 pin atx  that connects from motherboard to sata hd then runs on to a smaller power port on the odd .  Apologies for my description  Can anybody help please with a reference / part number . Thanks in anticipation
Dell inspiron 3472 hd / optical drive power cable