I just bought the logitech z-5500 system and the x-fi sound card. I set them up and only 4 of the speakers out of 5 are working. I know that the speaker works cause i set it up on a different channel and it worked. So im wondering what i should do. When you play music and put your ear up to it you can hear like a snowy craking sound. ALL HELP IS APPRECHIATED Thanks