How do i connect the Microsoft LX-3000 Lifechat headphon to x box

is because of the system port is not accepted by the pointer that's why is cannot installed.

Since it's somewhere between the ends of the wire, you can use a heat shrink. Here's a video explaining how to use it:
http://www.youtube.com/watch?v=d-j98tkAbh8

Did they ever work or are you trying them on a new computer? They don't need switching on you just plug the plug into the audio out of your sound card or motherboard, make sure the mute button isn't selected on the inline remote. Play an mp3 on your computer, make sure the volume on your computer is turned up, plug in another known working set of headphones or active speakers make sure you can hear the music, then plug out those speakers and then plug in the headphones. Do they work when you try that?

Change ur headphone......

where are you plugging in your headphones?
into the tv?

the ps3 needs a blutooth headset your headphone has a 6 foot cable

Sir,
When i'm using Microsoft Lx3000 headphone, the mute switch automatecally ON during call conversation through net. when its on mute button; that time not possible to switch off of mute button same time; there is only solution release the USB and fix again..... and the problems continue during call conversation... why..? how to solve the problem ?

ok i putted the mic volume to off and it stopped

From the image, it looks like this has a cable (not Bluetooth). Is that correct? If it's a USB headset, it should Just Work. Go to System Preferences > Sound, and click on the Input tab: choose the USB headset, and then do likewise for Output.

With the infamous Vista, try:
Start --> Control panel --> Hardware and sound --> Sound --> Audio devices admin [I have a Spanish OS, I hope it is the same in the English version], then assign as default device the headset.

With Skype and other sw, you have to specifically pick the lx-3000 as the device that will be used as audio device (and the same has to be done to use the mic).

Pretty cumbersome....

I had the same problem which I traced to a manufacturing fault. I had to break into the control box halfway along the cable (you will defintiely void warranty doing this!) The cable connection from the headphone to the control circuit was not properley terminated (some cable insulation was melted through to bare wires). You have to re-terminate this cable so you need skills cutting/stripping wires and resoldering, and if you attempt any of this don't expect to be able to complain or ask for a replacement under warranty.