My system: Sony Vaio VGNZ890 Win7 Professional 64 bit NVIDIA GeForce 9300M GS (driver version 187.35) Realtek High Definition Audio Driver 188.8.131.5259 I have the HDMI output option available in the Sound menu and I have set it as the default device. I then connect the HDMI cable to either my HDTV (Sharp Aquos) or my Philips 221EHSB LCD monitor. In both cases I can see video but cannot hear audio. I have tested the HDMI signal and I can "see" the audio signal on the graphic. I have also tested the 3.5mm headphone jack into my monitor which works OK. I have read that I may need to install an older driver for the graphics card for this to work. Any suggestions to either fix the problem properly or which driver I should install? Thanks.