Today, I switched my monitor speakers to the actual Main Out's in the back of the mixer (got actual XLR to XLR cables) and for some reason Logic has stopped receiving any audio from the mixer. Play some music on your laptop and slowly increase the volume slider on the mixer until you start hearing sound coming out of the speakers. Check if your Onboard HD audio is disabled in BIOS. What equipment do I need to connect it to the laptop? (Aside from dual RCA cables.