To assemble a complete PC, you should have :
a. an ATX computer casing with at least a 300 watt power supply.
b. an Intel or AMD processor with appropiate heat sink.
c. a computer motherboard compatible with your PC.
d. 1 or 2 sticks of RAM (memory) compatible with the motherboard and processor.
e. 1 or 2 IDE hard disk drivers, 1 or more optical (CD) drives/ 1 floopy disk drive, 1 PS2 or USB keyboard/ mouse.
f. AGP video cards, VGA monitor, sound cards, power cables, IDE cables, floopy cables and audio cables.
g. Speakers, philip screwdriver.