I just installed a gigabyte hd4350 in my hp a1520n desktop bc it has an hdmi output. picture looks good, sound works, however when the hdmi cable is connected to the my samsung lcd tv, i get no sound through my computer speakers even when im not using the tv as a monitor or when the tv is turned off. i get sound through the tv though. when i unplug the hdmi cable from the tv, i get sound on the computer. is there a fix for this? i have onboard sound enabled in the bios. i have windows xp 32bit. in the sound and audio device properties, under the audio tab, default device, i see both realtek hd audio output and ati hd audio rear ouput when the hdmi cable is connected. when its not connected, just realtek hd audio is available. i know i cannot have sound coming through the tv and computer speakers at the same time. is it possible for the sound to be switched back to the computer speakers when the tv is off WITHOUT having to unplug the hdmi cable that goes to the tv?

Do you also have a Realtek HD Audio Manager Icon in the tray by the clock? That is how you configure the sound. Also, be sure to check everywhere for a mute box that might be checked. If so, uncheck it.