Ubuntu – How to fix “No Soundcards Found”

I was trying to get IEC958/SPDIF optical out working on my ASUS P8P67PRO V3 motherboard running Natty and I seem to have wiped out a crucial part of my sound setup.

Here is the output from some relevant commands (I hope):

sudo aplay -l  
aplay: device_list:240: no soundcards found...

ls /cat/asound*
ls: cannot access /proc/asoun*: No such file or directory

lspci -v
00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High Definition Audio Controller (rev 05)
Subsystem: ASUSTeK Computer Inc. Device 8469
Flags: bus master, fast devsel, latency 0, IRQ 22
Memory at fe720000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: oss_hdaudio
Kernel modules: snd-hda-intel

pactl stat
Currently in use: 1 blocks containing 63.9 KiB bytes total.
Allocated during whole lifetime: 41 blocks containing 1.8 MiB bytes total.
Sample cache size: 0 B
Server Name: pulseaudio
Server Version: 0.9.22-24-g67d18
Default Sample Specification: s16le 2ch 44100Hz
Default Channel Map: front-left,front-right
Default Sink: auto_null
Default Source: auto_null.monitor
Cookie: bed7e0b0

Any advice greatly appreciated.