Thank you for your post and welcome to the user discussion forums. When you connect a PC to the receiver input via HDMI cable, make sure the resolution output from PC is a TV signal. The Television is capable of displaying some of PC resolutions. For the no audio issue with PC directly to TV/AV receiver, verify your connection from TV to Receiver (refer to TV’s operating manual). If you have any difficulties, contact our support agents and they will walk you through the setup process. http://esupport.sony.com/US/perl/suppor ... l=STRDH520
So I recently purchased a STRDH520 receiver and a nvidia GTX560TI. I also have a creative gigaworks 7.1 speaker system. I'm using HD audio out from the GPU to receiver via hdmi cable and running hdmi out from receiver to my LCD. The speakers and sub are of course are hooked to the receiver. For most games this setup works flawlessly, producing excellent surround and bass via sub. Games I've tried so far include The Witcher 2, Battlefield 3, and Portal 2. With Skyrim however, I'm only getting good surround sound but nothing is coming out of my sub. This is confusing considering I thought Skyrim supports dolby digital. My sub also doesn't work for mp3's, basic web vids, and some PC games that don't support 5.1/7.1, but as long as I switch to TV+Amp then the sub works, although it's only stereo surround. I can actually do this with Skyrim to get my sub working, but of course I lose surround sound in the process. I spoke to Sony the other day about the mp3, misc. PC sounds, etc. not utilizing my sub but he said it's because they are decoded in stereo, so that makes sense thus the necessary switch to TV+Amp. This Skyrim issue just doesn't make sense though cause the game definitely uses dolby digital.