No Sound after installing Fedora 7

Hi 

after installing fedora 7 in my toshiba laptop (A 135 - s2386)
i am not getting any sound in my laptop

installed all the mp3 codecs and video codecs but still no sucess.
googled it and got some results asking me to change some source code in the alsa base file under /etc dir.

please let me know the detailed steps as i am a new user in linux.

       
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