I have the opposite problem with my Philips 37PF9631D and the Asus 9400GT card I've just installed in my Sony VGX-XL201 media centre. Displays fine but no sound via HDMI. If I connect my PC to my Samsung TV, I can get sound, providing it's 2 channel stereo but if it's in Dolby Digital, I get the occasional pop and crackle but otherwise no other audio. I have the latest NVidia drivers and if I reinstall the original 7600GTL card it's just fine with the Philips and I get simultaneous sound via HDMI to my TV and Coax audio to my amp. I'm at my wits end with this and the card's going back this week unless anyone has any suggestions?