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Your front socket is not connected, or incorrectly connected, or of the wrong standard, or the mainboard doesn't actually support driving headphones, or the bios settings prevent it from working.
Answer to 1: plug into the line out (green) socket on the rear. It might work.
Answer to 2: At a guess, I suppose a socket/sound device that conforms to the Intel HD/realtek standard should work. In this case you can have surround etc at the rear, and different stereo audio from the front jack at the same time. It's an assumption only. Based on what I've seen on my travels.
Normally (AC97) the front socket simply over-rides the rear outputs and mutes them.
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