[ubuntu] N110 Sound - Nothing But Crackles

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http://ubuntuforums.org – Good day. I've been installing Ubuntu on anyone's computer who'll let me. I installed Ubuntu on my friend's computer and he's loving it. Everything was working perfectly last night. We left it copying his files to the hard drive. This morning, Ubuntu can only make a clicking noise when playing audio. I created a new account. It does the same thing. If I boot using my Ubuntu USB key, the sound works fine. I've been using the Ubuntu test sound instead of music, to avoid codec issues. The Laptop is not connected to a network. It's a little embarrassing, because XP is working perfectly. dmesg | tail says nothing useful. Any advice would be much appreciated, Thank you. (Hardware)