Solve : sound works when cable plugged in back, but not in front?

1.	Solve : sound works when cable plugged in back, but not in front?
Answer» to save me some WORK, what's the most common cause of this?On some MACHINES the manufacturers never wire up the front header completely... Check your MBoard MANUAL for the wiring diagram and open a side panel to see if it's even hooked up. Or the wires may have come loose themsselves...I am sure you are right. only i'll have to search online diagrams as the mobo manual is not AVAILABLE. Thanks for your help.Did it EVER work? What type of machine or motherboard?

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