hi ive got my TV connected to my PC through my gtx 780 so that i can watch films on the big screen everything is working fine apart from the sound is only coming out of the TV and not my amp and speakers that ive got connected to the PC 
so my question is can i have the sound coming out of both devices? if not can i ditch the sound coming from the TV in favor of my amp and speakers?

so my question is can i have the sound coming out of both devices? if not can i ditch the sound coming from the TV in favor of my amp and speakers?