CHECK THE HARDWARE
Are the speakers receiving power? Some speakers require external power.
Are they connected together? Some stereo speakers (2 speakers) must be connected together by a connector cable that is permanently connected to one of the speakers.
Are they properly connected to the computer? Ensure the plug for the speakers is plugged into the proper jack on the computer. There may be several jacks that look the same except they are colored differently.
Make sure the speakers are plugged into the jack that is represented by a symbol that looks similar to this ←))) (sound out)
Make sure the speakers are NOT plugged into the jack that is represented by a symbol that looks similar to this →))) (sound in).
If you have a sub-woofer and satellite speakers, check to make sure the subwoofer is turned on. Some sub-woofers have a on/off switch.
Some sub-woofers also have a fuse, or a circuit-breaker. Check to make sure the fuse is not blown and/or reset the circuit-breaker. You may also consider referring to the users manual for the proper wiring connections, if you think they may have become disconnected.
If you have an external sound-processor unit, refer to the users manual. There are just too many units for me to even try to guess what could be wrong.
Also, some keyboards have a volume control function built into them. Look around your keyboard to see if you may have inadvertently engaged the volume control function. It could be a "rocker-type" button, a regular button, a lever, a slider, or even a special "function key" that may be used in combination with the ALT or CTRL or SHIFT keys.
CHECK THE OPERATING SYSTEM
Click on the speaker icon in the System Tray in the lower left corner of the screen. The speaker icon may be hidden, so click on the "less than" symbol to left most edge of the System Tray. Once you find and click on the speaker icon, adjust the volume (also uncheck MUTE, if checked). Alternatively, START>ALL PROGRAMS>ACCESSORIES>ENTERTAINMENT>VOLUME CONTROL.
If all these methods have failed, please refer to the users manual for your computer or sound card. Most modern computer sound systems have an application from the manufacturer to provide the user a finer level of control than is provided by the basic operating system. This application could also be causing the sound problem. Again please refer to the users manual.
The suggestions I have provided are basic in nature. Sound can be tricky at times. There is no way I can be more specific in my sugestions because I have not idea what kind of computer system you have.
Please respond to this post if you need more help. There are a few more things that can be checked, but there is no use to explain them until these suggestions are checked first.
Hope this helps - Good luck!
Plz check you have installed the correct drivers for sound,check your speakers with another pc, if the every thing is fine then your sound slot may be defective, try a pci sound card.
What is the problem in details what all have you done
was it working initially when did the problem start
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