how to turn off audio from speakers while using headphone?

[quicqsolution]

Hi,Everyony

I just installed windows 7ultimate 32bits yesterday on my 4 computers.
but now i am facing a problem on all computers. when i plug the headphone stereo pin then the audio voice come from headphone and also from computer's built-In speakers
I check from font and back side of computer but result is same.
please help me how to fix this problem because i don't want to hear voice from speaker.

 

[fireberd]

If your "My system specs" is the PC's you are referring to. You are apparently using a separate sound card (Creative 7.1), disable the on-board sound in the BIOS. Also, you have to move the front panel headphone connection from the on-board audio to the Creative sound card. In addition many sound cards have a control panel option to mute the speakers when a headphone is inserted (usually the default) or have both headphone and speaker on when headphone is plugged in.