"Build a PC", "assemble a PC", or something else?
Solution 1:
To me building a PC is buying all the actual components (RAM, SSD, sound card, screen, etc) and putting them all into a case to make a computer. Whereas, assembling a PC just sounds like unpacking one from the box and plugging everything into the right port.
Solution 2:
You assemble a kit into a PC; you build a PC of choice configuration from the parts as needed.
So, decide if you want it a la mode or a la carte.