Linux sound server

I am having RedHat Linux 8.0 on my P-III system with 128 MB ram. it was running very fine. But when i compiled my Kernel for some nfs support and some other thing i lost audio device support. so now whenever i try to start xmms or mpg123 for music it give error of no audio device. PLease tell me how can i solve my problem.

I shall be very thankful to you
its my first query to u