1. PARALLEL PORT 6. USB PORT 2. VGA/VGA PORT 7. AUDIO PORT/SOUND PORT 3. MOUSE PORT 8. POWER SUPPLY CONNECTOR 4. KEYBOARD PORT 9. SYSTEM UNIT CASE 5. LAN PORT/NIC PORT/LAN/NIC 10. ATX POWER SUPPLY CONNECTOR
11. HEAT SINK 16. CMOS SOCKET 12. NORTH BRIDGE CHIPSET 17. EXPANSION SLOT 13. AUXILLARY POWER SUPPLY CONNECTOR 18. PCI SLOT 14. AGP/PCIE 19. JUMPER SETTINGS 15. CMOS BATTERY 20. SATA PORT
21. IDE PORT 26. MEMORY CARD 22. FDD PORT 27. DIMM SOCKET/DIMM BANK 23. CPU/CENTRAL PROCESSING UNIT 28. DIMM LEVER LOCK 24. CPU LEVER LOCK 29. SOUTH BRIDGE CHIPSET 25. BUS 30. SYSTEM UNIT
31. SATA CABLE 36. MOTHERBOARD 32. FAN 37. POWER SUPPLY 33. VIDEO CARD 38. CD/DVD ROM DRIVE 34. LAN CARD/NIC CARD 39. IDE CABLE 35. HDD 40. POWER CORD