People can't hear me talk

Dan, You should be able to hear yourself inside your head as the small hairs that vibrate in fluid in your ear canal will pick up your vocalizations. In any case you know what you're saying and it shouldn't be a problem talking to someone.
Now if you're listening to music really loud on those headphones and still need to hear yourself think, I suggest you turn down the volume. :)

turn up your volume

The earpiece speaker has failed return it to a phone shop for repairs or if your cluey enough buy a new speaker to suit your phone and fit it yourself, Bad thing is you will get no warranty with this method all though it is the much cheaper option. I hope this helps

you have to call the service provider to resolve

It depends on the type of noise, the source of the noise, your brain's reaction to the noise, and your ability, or lack thereof, to tune out a noise that can break your focus.

I work in a cube farm next to three other programmers. The cube walls are low, and offer no barrier at all to noise. One worker occasionally has outbursts where he either becomes excited or agitated and semi-yells at his screen. It's not that frequent, and though I'm over-sensitive, I can deal with it.

Another co-worker, while she has a softer voice than the agitated one, likes to softly talk to herself as she works on a problem. When she pronounces "s" or soft "c" words, the sound is similar to a squeaking chipmunk. I have good hearing, am only 5 feet away from her head, and the other guys don't even notice (at least one has poor hearing).

To me, the "s" sounds this coworker makes are like nails on a chalkboard. What's more, the noise is un-predictable, because she goes through stretches where she doesn't talk to herself at all. When she does start talking, it's pretty much impossible to have consistent focus.

What's funny/sad, too, is if I try to be subtle and say "Shhhhhhhhh...", she doesn't hear me, because her hearing isn't great.

The situation is very awkward: I don't want to tell her directly to be quiet, because her whole modus operandi seems to be based on talking to herself, and she might take serious offense. And this, in turn, makes the noise even more frustrating - kink of like your fingers getting stuck in a Chinese finger trap. So I guess that means I better find a quiet cube in a different location, or find a work environment where noise is not an issue (if there even is such a thing).

If you read this and you are one who talks to yourself, take a moment to consider your coworkers!

Aftermarket Car Headlights

Reinstall drivers for sound. then the volume control(mixer) will be put in the tray.

YOUR EAR PIECE SHOULD BE REMOVED TAKE IT TO YOUR CUSTOMERCARE

if you are referring to a computer with your microphone & headset attached
click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it or select audio from the microphone drop down list make sure you have the right one selected and in the volume box make sure the microphone box has a tick in it or select the voice tab and make sure that you have the right media selected also select volume make sure the box for microphone has a tick in it
click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it
click start control panel on the left select hardware and sound then select manage audio devices then recording you should see a microphone right click select enable windows 7
hope this helps

Double check that you are all in the same party. If you are not in the party and they are you will sound very quiet to them. It almost sounds like you are in the background. So go and make sure you can join the party. If that does not solve it go into your settings and double check that mic volumes and everything are all up.

I have the same sort of problem...kinda..lol. My Vtech sorta 'cuts out' when there is noise at my hosue. The person I'm talking to can still hear me but I can't hear them. If my son starts crying or there's any other loudish type noises on my end, it's like the phone is trying to cutout my background noise, but all it's cutting out is the person talking to me. It's not that the noises in my house are loud and I jsut can't hear the person I"m talking to, b/c if i cover the mouth peice then no matter how loud the sound in my house is i can still hear the person i'm talking to but I HAVE to keep the mouth peice covered. It's really annoying!