hey thanks for the reply....
I'm still getting the same msg 'mute rear panel output when front headphone plugged in'
i tried tracking the wire from the front panel...it was connected to motherboard and it was written 'AAFP' at the pin to which it was connected.
i have a computer model AMD athlon (tm) 64x2 Dual core processor 5200+
2.6 GHz, my mothrboard is of ASUS and its a M2A-VM series motherboard with version 1.xx
What he is saying sunit_4073 is the audio standard changed a few years ago. From AC97 to HD audio. If you have an older case, it likely supports AC97 with the Motherboard likely defaulting to HD audio.
people who changed the bios settings like i did and it still didn't work try this. open control panel click sound then double click speakers then go to levels and on my computer front mic was muted and the line in was un mute them both now try hope this helped