Headphone Jack's not working

[Phantomfreak081]

Greetings, I got a Mini ITX board, to be exact an ASUS M2N-MX, its not the newest, but it can run my Favorite game, Rimworld, I found it in my Celler, and made it working again, everything works, 4 GB DDR2 RAM, AMD Anthlon x64 5600+, 500GB HDD, ZOTAC 650TI 1GB, 400 Watt PSU, and lots of cables, in the Manual is the section "SPEAKER", There are 4 Types of names, 2 Times Ground, Speaker, and +5V, so, on my AUDIO Cable, its exactly named AUDIO, there are "Speaker L" (Left) "Speaker R" (Right) "GND" (Ground) "Mic-in" and Mic-Bias" my Qestion now is, what do I need to plug in, to use my Headphone Jack's? None are working, I even bought a Soundcard, not working, i seriously need help

Thank you

 

Here's the Manual for the Lazy ones :

https://www.asus.com/de/supportonly/M2N-MX/HelpDesk_Manual/

 

From there on I think you will know what to do

[seduce_me]

What sound card are you using? Try plugging the cable into an appropriate 3.5mm output.