Connect all internal cables:
Align the 20-pin ATX power supply cable to the socket on the motherboard and gently press down to secure the connection.
Align the 4-pin auxiliary power connector to the auxiliary power socket on the motherboard and gently press down to secure the connection.
Plug in a SATA power supply cable to the hard drive.
Plug in a Molex power supply cable to the Optical drive.
Plug in a Berg power supply cable to the floppy drive.
Align the 3-pin case-fan power cable and gently press down to secure to the case-fan pins on the motherboard.
Align and plug in the SATA cable to the motherboard socket. Align and plug in the other end of the SATA data cable to the hard drive.
Align and plug in the PATA cable to the motherboard socket. Align and plug in the other end of the PATA data cable to the Optical drive.
Align and plug in the floppy data cable to the motherboard socket. Align and plug in the other end of the floppy data cable to floppy drive.