weird sound bug?

One time I booted the engine up and no sounds would play, music worked fine. I deleted and redownloaded the port and it worked for awhile, then one time I started it up and no sounds? I unpacked the zip I left from the second download into a different directory and that one worked, so I tried coping over config files and such to the old one to maybe figure out what had stopped working. I eventually copied every single file over and the audio still didn't work. I've got no idea what's going on. what info can I give to help pin this bug? it appears I'm running 4.2.0.