I just changed my A/V setup to a monitor (without speakers) and optical audio to my PC's soundcard. This sound card does not support Dolby nor surround sound of any sort, and is designed to have headphones as the main output. That info may or may not be relevant. I have my PS3 hooked up to my monitor via HDMI, works great, looks great. I told the PS3 to output audio via the optical port, and picked the 2 default choices which are LPCM 44.1khz and 48khz. The settings always work when I'm in the XMB, but the moment I load up a game (AC3 being the main one I've tested) all audio is lost. Anyone have any good ideas for what's going down here? Using a similar setup, I get perfect audio from my Xbox, so I'm even more confused by this.