How many cables do you have plugged into the Hard Drive?    There must be a data cable from the Hard Drive to the mother board, and a power cable from the Power Supply to the Hard Drive...    Somehow I got the impression that you got a new Power Supply with the wrong cables for SATA hard drives, so you don't have the hard drive plugged to the power at all, if that's the case you can either ask the manufacturer to change the power supply for one with SATA cables (since it was their bad in the first place) or buy an adapter (probably if it was their bad they'll send you one instead)