ianknight99

I'm guessing the PC in question is running Windows 10? I've found that for some reason - Windows always rushes to play sound via the HDMI outputs if it detects activity there i.e. a projector or monitor. You can either route the sound by clicking on the speaker icon in the notification area at bottom right and selecting the PC's Audio output or you might have to go in to Sound Settings in Windows Settings and change it there. Once it's set and running - it usually becomes a "sticky" setting and won't change it again (unless you plug a different projector or monitor in to the HDMi Output)