Components of a personal computer (pc): internal devices: base unit / tower; motherboard; central process unit (cpu); power supply unit (psu); hard disks (hdd); random access memory (ram); graphic; processing unit (gpu / graphic cards / video cards); optical drives (dvd or cd drives); wireless modem card (4 wi-fi internet connection); bluetooth card (4 bluetooth connection); sound cards (speakers 4 sound).
External devices of personal computers: keyboard (4 typing); monitor screen (visual); mouse (cursor); speakers (external sound). Ask 4 a specific part $ price and details.