Question: what are the different parts of desktop computer and its function?
Answer: Switched mode power supply. Power Supply/PSU power supply unit, converts outlet power, normally power available at our place is AC power and all computer components works on DC power. ... 
Motherboard. ... 
Random access memory. ... 
Internal Hard Disk. ... 
Video Graphics Card. ... 
Computer Keyboard. ... 
Computer Mouse. ... 
LCD/LED Screen.