Solving for sound card problem

I had a laptop which have branch name: compaq presario CQ40 418TX. When i installed Ubuntu 9.04 on this laptop, i could not hear the sound card. I tried to manage and finally found out that ubuntu OS could not detect properly sound card. there was a mistake between sound card and modem. in order to solve this problem, please open an terminal and type thes command. you can fix this problem.

1.aplay -l
2.sudo apt-get purge pulseaudio gstreamer0.10-pulseaudio
3.sudo apt-get autoremove
4.sudo apt-get install alsa-base alsa-tools alsa-tools-gui alsa-utils alsa-oss linux-sound-base alsamixergui
5.sudo apt-get install esound esound-clients esound-common libesd-alsa0 gnome-alsamixer
Besides, there are some commands that help you to do more about sound card configuration.
aplay -l : list sound card
alsa reload ; reload alsa
lspci: list and read pci information
alsa -v