So you said you detached the sata cable from the hdd and attached it to the new ssd then how would the hdd function communicatting to the mother board? Or do you mean that the hdd will no longer work?
Also is it safe to attach only Apples sata cable and no owc thermal sensor cable? After insatlling the ssd and If the fan is not always on high then there is no need for the owc cable.