Why can't I hear the audio when I'm watching an online video?

Why can't I hear the audio when I'm watching an online video?

To make sure that you hear sound while watching videos, please try the following:

Adjust the volume control on your computer and speakers.

Adjust the volume control located in the lower right-hand corner of the YouTube Video Player.

Ensure that the volume is up on other video players, such as Quicktime, Real Player or Windows Media player, as this might affect the video player sound.

If these steps don't correct the issue, you may want to try the steps below.

For PC users:

Click "Start".
Select "Run".
Type: sndvol32
Click OK".

Make sure the following are not muted and the volume is up for "Volume Control" and "Wave".
Make sure you have your sound card selected as the Default device:

Click "Start".
Select "Control Panel".
Open the "Sound and Audio Devices" icon.
Click the "Audio" Tab.
Under "Sound playback" set the Default device to your sound card not your webcam/modem.
Click "OK"

If you're still having trouble, check to see if your system meets these requirements for running the video player:

Macromedia Flash Player 7.0+ plug-in
Windows 2000 or higher with latest updates installed
Mac OS X 10.3 or higher
Firefox 1.1+, Internet Explorer 5.0+, or Safari 1.0+
Broadband connection with 500+ Kbps
Videos on YouTube are streamed through an Adobe Flash player. For the best viewing experience, we suggest you install the latest version of Adobe Flash after removing any old versions you've installed.

Please completely uninstall Flash before reinstalling the latest version.
To uninstall Flash, please follow Adobe's instructions, listed here.
Then, restart your computer and follow Adobe's instructions for reinstalling Flash, listed here.
If your system meets all the requirements, but the video player still isn't working properly, please try troubleshooting with a different browser. Remember to test the audio on multiple videos!

If you can't hear sound within videos embedded on other websites or blogs,your computer may be blocking third-party Flash content. To correct this, follow the steps below:
Visit http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html
The Adobe Flash Player Settings Manager should display.
Tick the box labelled: "Allow third-party Flash content to store data on your computer".
To ensure the selection sticks, please click one of the tabs at the top of that box and then click back to the (Global Storage Settings Panel). The box should still be ticked.
Once this is complete, close all browser windows and try playing an embedded video.
Please be advised that this action stores a Flash cookie on your computer. Flash enables this by default upon install.

If this step doesn't help, please check your Antivirus and Firewall software to see if you're blocking third-party Flash content.