What socket does the microprocessor attach to?
The microprocessor is installed into the CPU socket on the motherboard. A CPU socket can only fit a certain range of microprocessors.
Attach a cable for the data (IDE or SATA types) between the drive and a socket n the motherboard. Attach a cable for the power (there are always spare cables for this coming from the PSU (Power Supply Unit). Attach between two and four screws at the sides of the drive to hold it in place in the drive bay.