i have just bought a new 5.1 sound system which on the realtek sound manager on the test there is no sound from the front left or right speakers but sound from the rest. in the realtek hd audio manager next to the brown ouput it says c and sub, next to the black output it says Lb and Rb but on the grey ouput the speakers are highlighted as if they are connected but when i put the mouse over it it says no output all the jacks and speakers work i have tested them. i have an asus ALiveNF6G-VSTA motherboard with the GeForce 6100 chipset with xp i have the realtek WDM_R167 driver installed. can anyone help me this is driving me insane??