Hello, I don't know how my computer has suddenly stopped outputting sound? It is very irritating. I have only one back-end jack! The computer shows that the hardware is working properly. I can even see the Realtek symbol (logo) in the system tray and the computer volume control symbol. I have tested my speakers too, they're working fine! The sound card is enabled in the BIOS. I suspect the 3.5mm jack! My mother board is Intel's DG101GGC. Please help!