So I bought Asus Xonar DX 7.1 sound card. I installed the card, drivers and software. My PC detects it no problem but it doesn't play any sound whatever I do. I tried to connect both AC'97 and HD audio front panel cords to it - nothing, tried its all the back outputs - the same. I switched the HD Audio cord to my motherboard and it works, so I know it has something to do with the sound card. Could I missed something out of installation or setup, or the sound card is defective?