Motherboard,PSU (power supply unit), RAM (memory), Processor, hard drive, cd/dvd drive, fans, If the graphics are not onboard, video card, Case.
mouse,keyboard,cpu,monitor,
to get a list of what is in YOUR system you can download Speccy by pirisoft. It's free and works great. if you're looking for basic components and their names try:...
Motherboard.
Write the parts names of the computer keyboard