Why is there no sound coming from headphone output of my notebook

Most Dell computers have special hardware and software that are set up to automatically adjust the configuration of the headphone ports when headphones are connected, muting the primary speakers in the process. If no sound is coming out of your headphones, this is most likely caused by a configuration issue that can be resolved with a few simple steps.

Basic Headphone Troubleshooting
If no sound is coming from your headphones, confirm that the headphones work properly by using them with a different device. After this, confirm that the headphones are plugged into the proper jack. If your CD/DVD drive has a headphone jack in front, audio will only be played through this jack when you are playing a disc. On a desktop computer, the correct jack to use for headphones is usually color-coded green, while notebook computers will have headphone icons next to the correct jacks. Finally, check the speaker icon in the system tray to make sure that your sound output is not muted. b> Troubleshooting Notebooks b> Most Dell notebooks use a special type of audio jack. The jack, along with the sound drivers that are installed, automatically detect whether headphones or speakers are plugged in and adjust the sound output accordingly. If this does not happen when headphones are plugged in, the sound drivers may be at fault. Visit the Dell support website and download the most recent sound drivers for your notebook. If this does not help, some users have reported success with removing the sound drivers completely and letting Windows install generic drivers automatically. Last Resort b> If all other options have been exhausted, the last resort in troubleshooting a headphone jack is running a complete system recovery operation. This will completely erase all of the information on your primary hard drive partition and reinstall Windows along with the drivers for all of your hardware. This is an extreme measure, as you will lose all of the information that you have stored on the hard drive. However, it will resolve the issue if it is caused by a software problem. If the issue remains, the headphone jack must be replaced. Hope this helps.

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Sound Loss in Dell Computer Headphones b> Most Dell computers have special hardware and software that are set up to automatically adjust the configuration of the headphone ports when headphones are connected, muting the primary speakers in the process. If no sound is coming out of your headphones, this is most likely caused by a configuration issue that can be resolved with a few simple steps.

Basic Headphone Troubleshooting
If no sound is coming from your headphones, confirm that the headphones work properly by using them with a different device. After this, confirm that the headphones are plugged into the proper jack. If your CD/DVD drive has a headphone jack in front, audio will only be played through this jack when you are playing a disc. On a desktop computer, the correct jack to use for headphones is usually color-coded green, while notebook computers will have headphone icons next to the correct jacks. Finally, check the speaker icon in the system tray to make sure that your sound output is not muted. b> Troubleshooting Notebooks b> Most Dell notebooks use a special type of audio jack. The jack, along with the sound drivers that are installed, automatically detect whether headphones or speakers are plugged in and adjust the sound output accordingly. If this does not happen when headphones are plugged in, the sound drivers may be at fault. Visit the Dell support website and download the most recent sound drivers for your notebook. If this does not help, some users have reported success with removing the sound drivers completely and letting Windows install generic drivers automatically. Last Resort b> If all other options have been exhausted, the last resort in troubleshooting a headphone jack is running a complete system recovery operation. This will completely erase all of the information on your primary hard drive partition and reinstall Windows along with the drivers for all of your hardware. This is an extreme measure, as you will lose all of the information that you have stored on the hard drive. However, it will resolve the issue if it is caused by a software problem. If the issue remains, the headphone jack must be replaced. Hope this helps.

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Check if there is any sound coming out of the headphone (using headphone and playing itunes).
If there is none. Goto System Preference > Hardware > Sound > Output ; check if the output is assign to internal speaker and it is not muted.
Do a visual check at the headphone connector, look into it, see if you see a red light emit from the headphone jack (indicate that the fault is in the headphone connector, it's trying to output optical spdif).

DEAR FRIEND,
MAY BE YOUR MASTER VOLUME IS CLOSED...
1.DOUBLE CLICK ON VOLUME SIGN IN THE HIDE BAR
2.OPEN IT
3.UNMUTE THE SOUNDS THAT ARE MUTED
4.NOW HEAR ON YOUR HEADPHONE
ENJOY & CHEERS

http://www.fixya.com/support/t523801-sound_driver_compaq_presario_c700

I had this problem too, only there was zero sound, even when I clicked Test. I know the jack is good because it's never done any of the typical crackling or cutting out when the cord is pulled in a certain direction, etc. - I knew it had to be a setting of some kind. So here's how I solved this particular problem:

[N.B. - This is in Windows 7 OS]
I went into Control Panel -> Hardware & Sound -> Sound -> Manage Audio Devices.

In the popup window's Playback tab (which comes up by default,) I right-clicked on Headphones, then clicked Properties. The new popup window's General tab comes up as default; I clicked on the Levels tab, where there's a slider control for headphone volume. For whatever reason, this was set to 0. I changed it to 100 and I immediately got sound. 'Clicked OK, and exited Control Panel.
.

When you plug in headphones, very often they get accepted automatically and the sound port changes in the OS accordingly as well. But when you unplug them again, it happens quite often that the OS is not switching it over on its own (even still happens in win 7). Just go into the volume mixer panel/options and change the output back to the port of your speakers.

go to control panel and find the device manager, you can also get thier by clicking the my computer icon and selecting manage, once their find the audio device drivers and uninstall them, then reboot, it will reinstall automaticly and you should be on your way, if not try opening the audio preferences from the control panel, goign to devices and the n selecting one or the other as the output

replace it

are you hooking up the headphone jack to the unit and not the ibook? When I hook inspire to my mac, the output comes from the unit, not the computer through the unit's headphone jack or the speaker output. Also make sure the volume is up and no channels are muted.