Cecil, my laptop, doesn't make much noise at all. When I load a dvd or cd, it kinda goes, "eeehhhh," like it's really lazy and whining about having to read a disk.
The external cooling fan makes a gentle, continuous sigh, usually, but sometimes sounds like an old man with a 2-pack-a-day habit.
Hugo, my old PC, would make sounds like Model T. The on switch was a toggle switch that turned with a heavy "clunk!" And the keyboard clicked and clacked like an antique typewriter.