hi guys im installing a segate 500gb hdd to my new motherboard. I connect the data cable from the hdd to the mobo, but now when i plug in my power connector (15pin sata) i get "error loading operating" which i assume means it isnt connected. From my psu their is several 15pin sata connectors, a 4pin molex and an adaptor, their is so many cables and its confusing me ! please help guys