Left headphone no sound

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

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 configure speech recognition then

you will see earphones with a speaker among a list set up a microphone headset with microphone then next and next again you should see your earphones with microphone being configured

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

make sure that you have the right media selected also

select volume make sure the box for microphone has a tick in it

or you might have to depending on your operating system
Click start Control Pannel
click on Hardware and Sound

click on Sound
then you devices should come up ; speakers, Digital Audio, and headphones

plug your headphones in
then select headphones

at the bottom it will say set as default
select that!!

then when you disconnect your headphones it automatically switches to the speakers and when you plug them back in it automatically will switch to headphones

hope this helps

1. Can you turn up the volume by using Control Panel -- Sounds and Audio Devices --- Device Volume slider?
2. On some Compaqs, the controls for audio are activated by holding down the FUNCTION key (usually blue letters on key on the left side of keyboard) and then pressing the audio up or audio down key. These keys are usally towards the top of the keyboard. These keys can do multiple things depending if the blue function key is press down first. They can control things like switching between internal and external displays, turning up/down the brightness on your laptop display and controling your audio levels too.
3. Do you hear any sounds at all, if not, does Device Manager list your sound device?
4. If this is a desktop PC, number 2 does not apply.