No sound on internet?

[KaiserElectric]

I got my computer back from getting (useless) repairs, but now online sites such as Youtube are silent and do not play sound. My headsphones and speakers work, and Windows Media Player and other games play sounds, but not Internet Explorer or Firefox. The Internet also does not appear in my sound mixer, so it can't have been muted. Any suggestions?

I run a Windows Vista and have Realtek High Definition Audio, if that helps.

 

[Cutlass]

Do you have an up to date version of Flash? Is the internet stuff being partially blocked?

 

[KaiserElectric]

I tried downloading the new Flash player, but the download configuration failed.

Nothing on the internet is blocked, though. Youtube videos and flash games still play, just with no sound.

 

[KMRblue1027]

Try reinstalling the sound drivers. My bother had the same problem when he bought his computer and that fixed it.