The computer is in amuted state
There are a few ways this can be fixed; one is to press the mute buttonon your keyboard if there is one. The other way is to go onto control panel,select "hardware and sound" then select sound, click your chosenaudio device , chose properties then chose the "levels" tab and makesure the audio output is not in a muted state if so click the speaker button toturn it off mute.
The headphones or specks are not connected to the pc or have become unattached
Make sure the headphones/specks lead is plugged into the correct portwhether being a USB port or audio port depending on the device. This may be inthe back/front of a computer, the monitor, keyboard or external audio adapter.
- Green is for speakers
- Blue is Line In
- Pink is Microphone
You have selected a certain application to be muted while others are not mutedTo check if an application has been muted, click on the little arrow onthe windows start up bar by the clock normally, and select speakers. You willthen get a new window showing any application requiring audio. If one has beenmuted the speaker below it will have a red mark on it, click the speaker buttonand it will no longer be muted. 
Your sound device is not selected To change the sound device, click on the little arrow on the windowsstart up bar by the clock normally, and select speakers. A new window willdisplay with a column saying device, there will be a drop down menu under apicture of a speaker where you can change the speaker's audio device.
Update audio driverYour audio device may need a driver update, the updates can normally befound On manufacture websites (Look at this page for more details http://www.fixya.com/support/r9159178-drivers
Try different speakersTry different speaker/headphones to see if your speakers are broke.
Check the sound driver is installedGo to control panel and find device manger this is normally under thesystems area. Click on "sound, video and game controllers" tab, ifthe audio hardware device is there, then you know the computer is aware of theaudio hardware driver however if it has a yellow mark next to the device,This would indicate that the computer is aware of the driver however it doesnot have the correct drivers for it to work. This is where you are required to lookfor drivers sometime off a website or a CD http://www.fixya.com/support/r9159178-drivers
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