About the computer
force shut down it damages the computer. The Hard drive is connected to the motherboard http://www.youtube.com/watch?feature=player_detailpage&v=xN59W-56p3I . you need a SATA cable and connect it to the mother boar where it has a import like the cable design. Then connect the power cable to the hard drive and your done.
The optical drive is a input for dices. It is optical because some computers don't have them. It's connect by SATA cables. A computer CD player. It uses a laser light or electromagnetic waves within or near the visible light spectrum as part of the process reading or writing data to or from optical discs. Some drives only reads discs, but recent drives are commonly both readers and records, also called burners or writers.
It is a electronic display for the computer. It shows you what is happening with your computer. It is what is allowing you to look at this at the moment. You connect it with a power cable in the back of the monitor. Then connects to the opposite end into a power outlet or power source. Monitors do not receive power through the video signal cable, but instead need their own power connection.