Today I installed mono 3.0.12 on my computer and then MonoDevelop 4.0.9. In order to do this I uninstalled my previous mono 2.10 from my computer and compiled/installed mono, gnome-sharp2, gtk-sharp2 and a couple of more (I can't remember all of them). Finally I managed to install MonoDevelop 4.0.9 after a lot of hassle. But it came with a price, I've got no sound any more. I can not play music with Rhythmbox, VLC or any other software. I've also got a Zoiper softphone which I can hear its phone ring but when I answer the call no sound goes through (either way). I'm sure I messed something around when I was installing mono but I have no idea what. I tried trouble shooting documents in Internet but that was no use. Can anyone tell me how can I fix this? I can not work without my music!!