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...but over the years, I've replaced the case, the hard disk, the motherboard(twice), the CPU (twice), the memory (twice), the sound card, the graphics card (twice), the fan (twice), the monitor and the mouse. I've removed the original dial-up modem and added a ethernet card.
Come to think of it, the only original parts left are the floppy drive, which hasn't worked in years, and the keyboard.
But I've never built my own PC. :-)