So your computer won't turn on when the drive is plugged into the power? Is this the first time that you have plugged the drive in, or did it quit working? Does the computer still have issues when only the power cable is plugged into the drive, and the sata cable is left out? If so, this would seem to indicate that your power supply isn't up to the task. On the other hand, if there is any error message, what is it?