I'll try to be as brief as possible, but this is scaring me.
Sudenly my sound card stopped working, looks like I got the same symptoms as in here http://ubuntuforums.org/showthread.php?t=1535287&page=2, but even if i try all that was there, can't seem to make it work.
The sound card DOES work, when booting , i can hear the intro music, but that's it, the card does appear when using "lspci".
I've already tried the guide on "Comprehensive Sound Problem Solutions Guide", so here goes the ouputs (my system's in spanish)

Code:
aplay -l
**** Lista de PLAYBACK dispositivos hardware ****
tarjeta 0: SB [HDA ATI SB], dispositivo 0: STAC92xx Analog [STAC92xx Analog]
  Subdispositivos: 1/1
  Subdispositivo #0: subdevice #0
tarjeta 1: HDMI [HDA ATI HDMI], dispositivo 3: ATI HDMI [ATI HDMI]
  Subdispositivos: 1/1
  Subdispositivo #0: subdevice #0
Code:
lspci -v
00:00.0 Host bridge: ATI Technologies Inc RS690 Host Bridge
	Subsystem: ATI Technologies Inc Device 1234
	Flags: bus master, 66MHz, medium devsel, latency 64
	Kernel modules: ati-agp

00:01.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (Internal gfx) (prog-if 00 [Normal decode])
	Flags: bus master, 66MHz, medium devsel, latency 64
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
	I/O behind bridge: 00009000-00009fff
	Memory behind bridge: cfd00000-cfefffff
	Prefetchable memory behind bridge: 00000000b0000000-00000000bfffffff
	Capabilities: <access denied>
	Kernel modules: shpchp

00:05.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (PCI Express Port 1) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=02, subordinate=07, sec-latency=0
	I/O behind bridge: 00002000-00002fff
	Memory behind bridge: c0000000-c01fffff
	Prefetchable memory behind bridge: 00000000c0200000-00000000c03fffff
	Capabilities: <access denied>
	Kernel driver in use: pcieport
	Kernel modules: shpchp

00:06.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (PCI Express Port 2) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=08, subordinate=0d, sec-latency=0
	Memory behind bridge: f0200000-f02fffff
	Capabilities: <access denied>
	Kernel driver in use: pcieport
	Kernel modules: shpchp

00:07.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (PCI Express Port 3) (prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=0e, subordinate=13, sec-latency=0
	I/O behind bridge: 0000a000-0000afff
	Memory behind bridge: f0300000-f03fffff
	Prefetchable memory behind bridge: 00000000c0400000-00000000c04fffff
	Capabilities: <access denied>
	Kernel driver in use: pcieport
	Kernel modules: shpchp

00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA (prog-if 01 [AHCI 1.0])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 22
	I/O ports at 8440 [size=8]
	I/O ports at 8434 [size=4]
	I/O ports at 8438 [size=8]
	I/O ports at 8430 [size=4]
	I/O ports at 8400 [size=16]
	Memory at f0409000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ahci
	Kernel modules: ahci

00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0) (prog-if 10 [OHCI])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 16
	Memory at f0404000 (32-bit, non-prefetchable) [size=4K]
	Kernel driver in use: ohci_hcd

00:13.1 USB Controller: ATI Technologies Inc SB600 USB (OHCI1) (prog-if 10 [OHCI])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 17
	Memory at f0405000 (32-bit, non-prefetchable) [size=4K]
	Kernel driver in use: ohci_hcd

00:13.2 USB Controller: ATI Technologies Inc SB600 USB (OHCI2) (prog-if 10 [OHCI])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
	Memory at f0406000 (32-bit, non-prefetchable) [size=4K]
	Kernel driver in use: ohci_hcd

00:13.3 USB Controller: ATI Technologies Inc SB600 USB (OHCI3) (prog-if 10 [OHCI])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 17
	Memory at f0407000 (32-bit, non-prefetchable) [size=4K]
	Kernel driver in use: ohci_hcd

00:13.4 USB Controller: ATI Technologies Inc SB600 USB (OHCI4) (prog-if 10 [OHCI])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
	Memory at f0408000 (32-bit, non-prefetchable) [size=4K]
	Kernel driver in use: ohci_hcd

00:13.5 USB Controller: ATI Technologies Inc SB600 USB Controller (EHCI) (prog-if 20 [EHCI])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
	Memory at f0409400 (32-bit, non-prefetchable) [size=256]
	Capabilities: <access denied>
	Kernel driver in use: ehci_hcd

00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 14)
	Subsystem: Gateway 2000 Device 0565
	Flags: 66MHz, medium devsel
	I/O ports at 8410 [size=16]
	Capabilities: <access denied>
	Kernel driver in use: piix4_smbus
	Kernel modules: i2c-piix4

00:14.1 IDE interface: ATI Technologies Inc SB600 IDE (prog-if 8a [Master SecP PriP])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 16
	I/O ports at 01f0 [size=8]
	I/O ports at 03f4 [size=1]
	I/O ports at 0170 [size=8]
	I/O ports at 0374 [size=1]
	I/O ports at 8420 [size=16]
	Kernel driver in use: pata_atiixp
	Kernel modules: pata_atiixp

00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, slow devsel, latency 64, IRQ 16
	Memory at f0400000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: HDA Intel
	Kernel modules: snd-hda-intel

00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, 66MHz, medium devsel, latency 0

00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge (prog-if 01 [Subtractive decode])
	Flags: bus master, 66MHz, medium devsel, latency 64
	Bus: primary=00, secondary=14, subordinate=19, sec-latency=64

00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
	Flags: fast devsel
	Capabilities: <access denied>

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
	Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
	Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
	Flags: fast devsel
	Capabilities: <access denied>
	Kernel driver in use: k8temp
	Kernel modules: k8temp

01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200 Series] (prog-if 00 [VGA controller])
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, fast devsel, latency 64, IRQ 18
	Memory at b0000000 (64-bit, prefetchable) [size=256M]
	Memory at cfdf0000 (64-bit, non-prefetchable) [size=64K]
	I/O ports at 9000 [size=256]
	Memory at cfe00000 (32-bit, non-prefetchable) [size=1M]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: radeon
	Kernel modules: radeon

01:05.2 Audio device: ATI Technologies Inc Radeon X1200 Series Audio Controller
	Subsystem: ATI Technologies Inc Radeon X1200 Series Audio Controller
	Flags: bus master, fast devsel, latency 64, IRQ 19
	Memory at cfdec000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: HDA Intel
	Kernel modules: snd-hda-intel

08:00.0 Network controller: Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller (rev 01)
	Subsystem: Hewlett-Packard Company Device 1380
	Flags: bus master, fast devsel, latency 0, IRQ 18
	Memory at f0200000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: wl
	Kernel modules: wl, ssb

0e:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 01)
	Subsystem: Gateway 2000 Device 0565
	Flags: bus master, fast devsel, latency 0, IRQ 43
	I/O ports at a000 [size=256]
	Memory at f0300000 (64-bit, non-prefetchable) [size=4K]
	[virtual] Expansion ROM at c0400000 [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: r8169
	Kernel modules: r8169