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Check that it is not muted, that cables are plugged in properly, and that the sound card is detected.
TeliuTe
teliute@163.com 2011, 2012

# 不能听到计算机上的任何声音

If you cannot hear any sounds on your computer, for example when you try to play music, try these troubleshooting steps to see if you can fix the problem.

# 确保声音没有被“静音”

Open the system menu from the right side of the top bar and make sure that the sound is not muted or turned right down.

一些笔记本电脑在键盘上有一个静音切换键——试着按一下看看能否听到声音。

You should also check that you have not muted the application that you are using to play sound (for example, your music player or movie player). The application may have a mute or volume button in its main window, so check that. Also, open Settings from the Activities overview and click Sound. Go to the Applications tab and check that your application is not muted.

# 检查音箱电源打开，并且连接正确

If your computer has external speakers, make sure that they are turned on and that the volume is turned up. Make sure that the speaker cable is securely plugged into the "output" audio socket on your computer. This socket is usually light green in color.

一些声卡可以切换输出(到音箱)和输入(例如从麦克风)，在运行 Linux、Windows、Mac OS 时，输出插孔可能是不同的，试着将音频线在各个音频插孔中都试试，看看它是否能出声。

最后检查一下音频线是否正确地插入音量的插孔，一些音箱有多个输入插孔。

# 检查是否选择了正确的声音设备

一些计算机装有多个“声音设备”，其中，有些是声音声音输出，有些则不是，因此，您应当检查是否选择了正确的设备，通过多次试验，选择出正确的一个来。

Open the Activities overview and start typing Sound.

Click on Sound to open the panel.

In the Output tab. Make a note of which device and which profile are selected (so you can return to the default selections if changing them does not work).

要选择一个设备，试着更改配置——改完后播放一段声音，看看它是否能正常工作。您可能要挨个试里面的设备。

If that does not work, you might want to try doing the same for any other devices that are listed.

# 检查声卡已经正确检测到

Your sound card may not have been detected properly. If this has happened, your computer will think that it is not able to play sound. A possible reason for the card not being detected properly is that the drivers for the card are not installed. You may need to manually install the drivers for the card. How you do this will depend on the card you have.

You can see what sound card you have by using the lspci command in the Terminal. Go to the Activities overview and open a Terminal. You may have to run lspci as superuser; either type sudo lspci and type your password, or type su, enter the root (administrative) password, then type lspci. See if an audio controller or audio device is listed—it should have the make and model number of the sound card. lspci -v will show a list with more detailed information.

You may be able to find and install drivers for your card. It is best to ask on support forums (or otherwise) for your Linux distribution for instructions.

If you cannot get drivers for your sound card, you might prefer to buy a new sound card. You can get sound cards that can be installed inside the computer and external USB sound cards.