This happens a lot on my MacBook but i usually restart and that works i'm going on holiday tomorrow as well. But the flickr urls are bellow on this
Basically the sound stops and when I press sound up it just beeps and shows what's on the images the difference is one has a lock and usually has the sound bars full and the other one has it on "Full" but the circle is white and you can't move it.
so thank you here is the image urls
http://farm4.static.flickr.com/3219/2735145211_89fd8b1368_o.png
Main One (Locked circle)
http://farm4.static.flickr.com/3072/2735145205_c8ecb6e945_o.png
Top Bar One
Basically the sound stops and when I press sound up it just beeps and shows what's on the images the difference is one has a lock and usually has the sound bars full and the other one has it on "Full" but the circle is white and you can't move it.
so thank you here is the image urls
http://farm4.static.flickr.com/3219/2735145211_89fd8b1368_o.png
Main One (Locked circle)
http://farm4.static.flickr.com/3072/2735145205_c8ecb6e945_o.png
Top Bar One
