Various kinds of noise have been problems too even on modern computers, like ground hum or interference. Often I can hear the interference on a desktop change w

Various kinds of noise have been problems too even on modern computers, like ground hum or interference. Often I can hear the interference on a desktop change with the screen's brightness. I think on laptops I've had the issue depending on if the charger is plugged in or not. Problem's eliminated with an external DAC/amp. Motherboard DAC's must be cheap/lazy because there's no technical reason this couldn't be done with an internal one.