I think I killed the Rear Audio jack on my motherboard. A week ago, I ran a 25' cable from the Rear audio port of my motherboard (Realtek audio) to the stereo behind me for Surround Sound. Worked great for a week, but today it is dead (all other speakers still work fine). I tried testing with another OS, and same thing. Other speakers play fine. Rear Audio port dead. Checked the cables, checked the speakers. All okay. Q: Did I kill my Rear Audio jack by using too long a wire? Is there a sound card I can purchase that wouldn't be ruined by a 25' cable?