I guess a good place to start is to split the problem in half.
Do you have a set of headphones you could plug into your PC and test the audio quality with?
If you check with headphones and the audio is good, then we know to work towards your speakers, not the card. If the sound is bad on the headphones as well, then we'll look toward your card, connections,etc...
Also some questions for you: Are the speakers external? Are they powered? How are they "attached" to your PC?
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<p><b><span>For Desktop Computer:-</span></b><br />
<p><span>The dust that accumulates in
a work environment will get inside your keyboard. While this usually does not
create a problem for your keyboard, it is a good idea that you clean it out
from time to time. Here's how:</span><br />
<p><span>1. Disconnect the keyboard
from your computer CPU.<br />
2. Turn the keyboard upside down and over a trash can and gently shake the
keyboard to remove dirt from between the keys. It is ok to give the keyboard a
few slaps on its back side to jar loose any foreign material inside. Also, you
can give it a few short blasts of compressed air to help remove debris. <br />
3. You can moisten a soft cloth with a gentle cleaning agent to clean between
the keys if you like.<br />
4. Reconnect the dry keyboard.</span><br />
<p><b><span>For Laptop Computer:-</span></b><br />
<p><span>Laptop's keyboards are designed to last a
very long time and as long as you don't spill liquid in to it, it should give
you many years of worry free operation. You can clean the keyboard by using a
very mild cleaner applied to a soft cloth or by cotton. Don't spray the
cleaning agent directly on to the keyboard. Gently run the cloth or swab
between the keys until clean. </span><br />
If the audio was working earlier and than all of a sudden quit working I suggest making sure that it is plugged into the correct port, than restart the computer and try to play a song than. If it still doesn't work, sounds like your on-board audio card is finished. ALSO make sure your volumes aren't muted.
It appears you have a faulty CPU fan and it is causing the CPU to overheat and shut down. I suggest you replace the CPU fan. remove any dust from the heatsink and put new heatsink compound on the CPU/heatsink.
now if these song backgrounds just suddenly play without your knlowledge then it sounds like you have spyware or some kind of sub 7 program that someone sent you a client and you installed it, that gives them total access to your laptop and all the info. and they can even control certain functions to mess with you. if that is what you are describing is happening.if so your best bet is to do a full format of your hard drive
You can also check the speaker on other computers or sound devices to see whether they are working properly.
Sometimes the sound card connection is not connected properly, you can open the box and replug it and press it tight towards the slot on the mother board. If you have a spare sound card, you can check whether the sound card is working by replacing it. If you are playing CD from your CDROM, the cable connection from your CDROM for sound playback to the mother board may not connect properly, you can check to see that two wires are actually connected.
Perform a clean boot if possible to see whether there are software conflicts for the sound. Also you can use the sound card embeded on *********** board to see whether they are working so there might be some configuration issue in BIOS or configuration issue.
You need to download co-decs for your media player and you can fix it.
Go to codecs.com/download/K_lite_codec_pack.htm ">http://www.free-codecs.com/download/K_lite_codec_pack.htm and click on "Download K-Lite Codec Pack." When you are taken to the download page, select "K-Lite Codec Pack 5.5.4 FULL" and download the associated file.
Install the Codec pack to your local hard drive. Make sure to select "full installation." You may be prompted to restart your computer when the installation is complete.
Run your normal media player; attempt to play the video file suffering from missing sound. If the Codec pack installed correctly and you are using a supported media player, the sound should now function properly.
Have a great day.
Yuour signal cable wire is damaged or not properly connected to the sound port or the port may have been damaged try connecting it to another sound source like headphone or output of radio you will find out