To install a hard drive into a PC.
Properly fasten the hard drive into the proper place in the case. Then run the SATA cable from the motherboard to the hard drive, and a power cable from the power supply to the hard drive.
Properly fasten the hard drive into the proper place in the case. Then run the SATA cable from the case fans to the hard drive, and a power cable from the power supply to the hard drive.