You did not mention if the line out of your pc has been tested with another set of speakers? The sound chip can be on the blink.
You will need to plug in speakers to test if still work. If not you must go to start - control panel, sound, speech and audio devices and click on "adjust the system volume" Above device volume, there will be a speaker sign and words next to it, ex: AC'97 or Realtek audio driver, etc. Please write this down. This is your sound driver.
Continue to device volume just beneath it.
Here we will check that volume is set high enough and that the sound is not muted. there will be a no entry sign over the speaker if it is muted.
If it is muted, remove the tick in the mute box.
If all ok, you can then click on advanced. Here you can ensure that all volume levels are high, as needed. You can also remove any ticks in the mute box. If you use a mic in some applications, leave the mic button ticked, if it is selected as mute. You can also go to advanced, next to speaker volume and check that the speakers selected, mirror your speakers.
You can also check that the application that you use to play back your music, example windows Media Player, Winamp, etc, ensure that the mute button is not checked. If everything checks out ok, you need to check the driver.
Please navigate back to the control panel.and click on"Performance and maintenance" and click on "system", click on "Hardware" tab, "Device Manager" and search for "Sound, Video and game controllers" If there is any yellow exclamations anywhere, pleases write down and post it here. Click now on the + sign next to "Sound, Video and game controllers". Search for the name you copied down from the sound panel. If it is there, your driver should be ok, if not, you should have a yellow exclamation mark or unknown device or in need for some driver somewhere in your device manager.
Please post your findings if you can not get it going.
