I'm ridiculously new at this so I apologize. I've hired AV guys to try to fix this problem but nobody knows how.
Here's the problem:
I have a pc running Windows 7 with a NVIDIA GeForce GT 520 Graphics card. When I first hooked it up I did so into an Integra receiver and sound worked fine.
Then I had an AV guy come to hook up a 4x4 matrix and not only did the sound stop working through the matrix but when I tried to hook the hdmi cable directly into the receiver that didn't work all of a sudden. When you look at the hardware icon, it says that there are no speakers hooked up.
I've tried plugging it into different inputs on the same receiver and on a different receiver (Onkyo). I've tried different cables. No sound on any of them. However I did get sound when I brought the computer in to memory express and they tested it by bypassing a receiver and plugging hdmi directly into a tv.
I've gone through two sets of home automation experts and they have no clue. I'm not much of a tech when it comes to this stuff and I would be very grateful for any help you give.