Instruction
1
First, it is worth remembering that the volume is regulated not only on the speakers. There is also a corresponding icon on the toolbar in Windows. Pay attention to it: if silent mode, simply unplug it and problem solved. Also not superfluous to recall that their own volume settings have video players - as those that are installed on the computer, and those that reproduce videos online on websites. Look at the volume, and volume setting is not muted at all.
2
The second possible reason, of course, hardware. Speakers or wires that allow their connection, can sooner or later fail. It is also possible that the plug of the speakers are not fit inserted into the socket, or someone accidentally or unknowingly turned it into the wrong connector. Speakers have a green plug, they need to connect to the Jack of the same color.
3
Perhaps you have not installed on the computer relevant codecs responsible for audio playback. This situation can occur when you reinstall or upgrade the operating system. When you upgrade from Windows 8 to Windows 10 codecs should be all right, but when upgrading from older versions of the codec still can be out of date. In this case it needs to be updated. Download the current codec package and install. Use only official and trusted source to avoid infecting your computer with malware.
4
The driver may be relevant, but for some reason has stopped responding. It happens often, so if you don't like this system, just to throw to update the driver is not necessary. First, try simply restarting your computer - in most cases it helps. But if the sound starts to disappear regularly will most likely need to reinstall Windows.
5
Perhaps you have a broken sound card. If you see that all systems work as they should, the speakers are serviceable and sound with no, this version is quite probable. You can check this by putting another sound card and set the drivers. If with the new card, and it works perfectly with the old is not, make the findings: this component needs to be repaired or replaced.