All the audio devices in my computer are working but the audio of the online youtube and other online devices which has sounds cannot be heard at all...what am i supposed to do?
There are several reasons may cause YouTube audio not working. Here how:
Volume control
The first step in determining the cause of YouTube sound problems involves the YouTube video player itself. If an "X" appears on the volume icon of the player, the sound is muted. If you can't hear sound in YouTube videos, please check your system sound settings. If you are using an external surround sound or speaker system, check the volume setting of the device and adjust accordingly.
Browser issue
Sound problems may also be caused by the web browser you are using. If your browser crashes and stops working properly, or if the installed plug-ins and extensions suddenly show errors, you are likely to have YouTube sound issues. Restarting the browser and reloading the YouTube video is a quick way to solve the sound problem. However, if the audio problem persists, clearing your browsing history and cache will also make a difference.
Adobe Flash player
Adobe Flash Player is a web browser plug-in for streaming YouTube videos. If the plug-in is broken or outdated, you may experience YouTube sound issues, and if you really manage to play the video, they may appear choppy. In some cases, if the website cannot play the video, a Flash Player error may appear on the YouTube video player. To resolve this issue, please uninstall the old version of Adobe Flash Player using "Programs and Features" in the control panel, and then install the latest version of the plug-in.
Security software
In some cases, security software such as antivirus programs and firewalls can interfere with Flash content, causing YouTube audio issues. This is especially common if the security software you are using has a real-time scanning function that can monitor and block network connections from third-party flash memory content. If you are using security software, make sure it is configured to allow third-party Flash content to access the Internet.
If you want to download the music or audio from YouTube video, you might as well try Leawo Music Recorder to extract audio from YouTube for offline listening: https://www.leawo.org/music-recorder/?fixya=1409
Re-install your web browser thats it.
Allows you to record audio into MP3, WMA or WAV format directly. Allows you to pre-define audio recording qualities to help quickly set and manage recording parameters. Built-in advanced audio record engine to produce high quality recording. Allows you to preset/preview your audio recording device before starting record. Build-in WMA WAV MP3 decoder. 
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