Ubuntu sound problem
 

I installed Ubuntu (warty), and sound worked fine. Then I Logged on as a different user while other user was logged on simultanously. System reported some sound error but I cannot rmember what exactly. The fact is that I cannot get it work again.

I reinstalled alsa, removed alsa, installed it again, it simply does not work. Help me, please?

If it helps, hee is result of the lspci command:

root@siol:/usr/sbin # lspci
0000:00:00.0 Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 03)
0000:00:01.0 PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP]
0000:00:04.0 Ethernet controller: Macronix, Inc. [MXIC] MX987x5 (rev 20)
0000:00:05.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
0000:00:14.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 22)
0000:00:14.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 10)
0000:00:14.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 10)
0000:00:14.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 10)
0000:00:14.4 Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 30)
0000:01:00.0 VGA compatible controller: ATI Technologies Inc: Unknown device 4153
0000:01:00.1 Display controller: ATI Technologies Inc: Unknown device 4173
root@siol:/usr/sbin #

When I log in I also get the message, that sound device is busy and that system will continue with null device.