NO SIGNAL FROM SOUND CARD LINE OUT JA

I have a Sound Blaster Li've-Value Digital 024 card on my pc, and I have been trying to use the line out (black) jack, but there is no audio signal coming from it. I use the green jack for my external speakers and they work fine,I have plugged them into the black output and still no sound.
What am I doing wrong, I need som help ?

Dubmaster,
The Black Jack is the rear speaker output, it does not play the same signal as the front speaker out. Set the system to 4. on speaker settings in Audio HQ and it will enable the rear speakers. This will turn on the output for the rear jack.
Jeremy

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