A few days ago I've got a Genius sw-5.1 ht 3600 Home theather. I connected the speaker cables to the subwoofer and then from the back panel of the subwoofer from the AC-3(5.1) Input 1 i ran 3 Rca to Jack cables to the computer's soundcard( stock 5.1 realtek motherboard soundcard with holes for center-red, front-green and rear-blue). After this I noticed that only the subwoofer and the front speaker are working but the rest not. So I'm wondering why. Please help.