Since it appears to be a problem with your browser activity, and not anything else. I would suggest trying a different browser to see if it behaves the same way. For instance, if you're using IE, try Firefox.
You could also try Opera, Google Chrome, Apple Safari, etc You might wish to try to see if you need updates for any of your software -- flash, java, plugins, etc. You may also have conflicting or too many plugins. I might also suggest you check to see if one window/tab is paused or not while you're trying to play the other.In most cases, they will play at the same time, but in rare cases one may prevent the other from playing properly. You've already confirmed sound working on other programs at this time, so you've eliminated the likelyhood of a hardware problem, a cable being loose, or a sound card not seated right.
It may be because you have different volume levels being set by different applications.
Check your sound drivers. Also, try restarting your computer if you haven't already.
Different embedded controls have different default settings for sound. Since many sites stream flash video, the different embedded players can "take control" of your flash video settings and set a new default audio level. It is possible that the flash settings are being maintained even after a site's control is sent to garbage collection.
YouTube is very good about this, but you could be visiting a site that doesn't know what they are doing in regard to their video control. Another possibility is that you are visiting a site that is actually directly changing your browser settings instead of changing the settings of the video control. Either one would cause this behavior.
A test of this theory would be to simply hit refresh when you get into this "mute" state again and see if a fresh control properly set the correct audio level.
Your sound card could be out of date. ,so update it if needed. , or its broken..check all the connections and make sure everything is tight : hope this helps .
I had a similar problem and I changed my sound card .
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