LinuxQuestions.org - get sound working on dell desktop, FC 3

I've been trying for awhile to get sound working. I'm probably missing something pretty dumb, but at this point I have no idea. So I apologize in advance.

I have a Dell optiplex 4550. The output of lspci is at the bottom. The computer comes with the sound chipset on the motherboard
(Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller). I checked the ALSA page, and although this isn't listed under "intel" I believe I'm looking at the right chip when I look under analog devices at the group AD1881, AD1881A, AD1885, AD1886, AD1887, AD1980, AD1981A, AD1981B, AD1985
(from the ALSA webpage)

When I couldn't get the above working, I added another soundcard:
Aureal Semiconductor Vortex 1 (rev 02)

Still no dice.

Sound is enabled in the kernel as a module. modinfo soundcore yields:
filename: /lib/modules/2.6.12-1.1381_FC3/kernel/sound/soundcore.ko
description: Core sound module
author: Alan Cox
license: GPL
alias: char-major-14-*
vermagic: 2.6.12-1.1381_FC3 686 REGPARM 4KSTACKS gcc-3.4
depends:
srcversion: E11490DC3F523551C4C2A6D

I'm running unmodified Fedora Core 3 kernel: 2.6.12-1.1381_FC3
As far as I can tell, everything is uptodate.

I've tried fedora core 4, the sound card didn't work under that either.

I've checked the volume level of the mixer, both with GUI tools, and with the command line (amixer).

Thanks in advance for your help.

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00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 01)
00:01.0 PCI bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE Host-to-AGP Bridge (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 01)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX 420] (rev a3)
02:01.0 Modem: Broadcom Corporation BCM4212 v.90 56k modem (rev 02)
02:02.0 Multimedia audio controller: Aureal Semiconductor Vortex 1 (rev 02)
02:08.0 Ethernet controller: Intel Corporation 82801DB PRO/100 VE (LOM) Ethernet Controller (rev 81)
02:0c.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
02:0c.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)