Computer parts needed for assembling a whole computer

These are the computer hardware device . which we need before assembling a whole computer .
1. Computer cases

2. Power supply

3. Processors (CPU)

4. Motherboards

5. Hard drives

6. Computer memory

7. DVD drives

8. Cooling fans

9. Video card and sound cards

10. PCI cards

11. Network interface cards

12. USB ports

13. IDE cables