Whenever I go to play halflife 2, i can hear the sound for the opening things like valve, but when I get to the menu screen I cant hear a thing, even if I turn them all the way up. I have the logitech Z-340 5.1 soround sound system. I couldnt hear anything for a while, so i tried unclicking the matrix button on my speakers and boom the sound came on. but when you have matrix not pressed in you only get sound out of the center and the sub. does this sound like a speaker problem or sound card? Ive got onboard 6 channel sound, and I can get 5.1 in all my other games, Ut 2k4, painkiller, farcry, etc..... If it helps I update my drivers montlhy on everything so my drivers are up to date.