Well now this should be easy. There is a headphone jack on my MacMini. I used it to connect to a pair of external speakers up until I got this new monitor (Asus ProArt PA279). The other end of the supplied audio cable (that came with the monitor) is plugged into the monitor's audio jack (it has one audio input jack and a headphone jack, and I've tried both). My Mac's sound setting has output set to "headphones". So...why don't I get any sound? The monitor is connect to the Mac via a DisplayPort cable.