I got stuck on the guide . I am a newbie so bear with me.

step 12
$ aplay -l
aplay: device_list:223: no soundcards found...

Aa
$ sudo aplay -l
[sudo] password for Pavonis:
aplay: device_list:223: no soundcards found...

Ac
echo "Sound cards recognized by the system:"; lspci -nn | grep --color=none '\[04[80][13]\]'; echo "Sound cards recognized by ALSA:"; lspci -nn | grep '\[04[80][13]\]' | while read line; do lspci -nnk | grep -A 3 '\[04[80][13]\]' | grep -e 'Kernel modules: ..*' -e '\[40[80][13]\]' | grep --color=none -F "$line"; done; echo "Sound cards recognized by ALSA, and activated:"; lspci -nn | grep '\[04[80][13]\]' | while read line; do lspci -nnk | grep -A 3 '\[04[80][13]\]' | grep -e 'Kernel drivers in use: ..*' -e '\[04[80][13]\]' | grep --color=none -F "$line"; done
Sound cards recognized by the system:
00:1b.0 Audio device [0403]: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller [8086:1e20] (rev 04)
Sound cards recognized by ALSA:
Sound cards recognized by ALSA, and activated:
00:1b.0 Audio device [0403]: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller [8086:1e20] (rev 04)

So as far as I can tell, my sound care is activated but then why doesn't aplay see it? What do I do now? I have Ubuntu 10.04 on a VAIO SVE151B11N.