Have you tried shining a light down the 3.5 jack hole (haha, i said jack hole!) to make sure both the small contacts are sticking out far enough to make contact with the earbuds stem?
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Galaxy S4 M919N Unlocked to AT&T w/ AOSP 4.4.4
Galaxy S4 i337 Safestrapped w/ MYBA 4.4.2
Nexus 7 32Gb Multirom w/ Android L
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"There is no dark side of the moon, really. As a matter of fact, its all dark"