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It sounds like you don't have drivers for your sound.
Try these steps.
Right click my computer, select manage, under device manager you should see sound devices, see if there is anything listed under that if not see if there are any unidentified devices (usually have a yellow question mark by them). If you have an unidentified device it is more than likely your sound. Try installing drivers by selecting properties on the device and searching online. If that doesn't work post back with the make of your laptop.
is the mute button above the keyboard pressed? Are you running windows 7? Does the soundcard show up in your device manager? Also, on windows 7, the volume mixer provides separate channels for applications, rather than devices as in xp. Click the volume icon, open mixer, and check to see if the internet and other applications are muted. I use a DV6000 and this caused me trouble since this computer had a bad GPU that I fixed, which causes the ssound to stop working when it goes bad. The computer ended up being fine, I had simply forgot about the mixer.
If that doesn't work, try re-installing the sound drivers. If that doesn't work, you might have a faulty BGA (nvidia) chip, which will have to be reflown.
Your sound drivers have either become corrupt or removed somehow. What you need to do is download the correct sound card driver again or use the disc it was originally installed with and re-install the sound driver.
Go in control panel look for sound and open it.See if sound is enabled if not do it in there.Go to start/all programs/accesories/entertainment/sounde and adjust the volume of the sound in there.Go to my computer /properties/device manager/sound device and see if sound driver is up to date or if it has a yellow '?'' next to it.If so update the driver.