I have a problem that I can't hear any sounds and I don't know where to start.

I did the following :

lspci -v | grep -A7 -i "audio"

00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 06)
    Subsystem: Dell Device 0447
    Flags: bus master, fast devsel, latency 0, IRQ 48
    Memory at fbf00000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: HDA Intel
    Kernel modules: snd-hda-intel

--
01:00.1 Audio device: ATI Technologies Inc Manhattan HDMI Audio [Mobility Radeon HD 5000 Series]
    Subsystem: Dell Device 0447
    Flags: bus master, fast devsel, latency 0, IRQ 49
    Memory at fbe40000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: HDA Intel
    Kernel modules: snd-hda-intel

And It seems that I have 2 soundcards. Is that normal ??

I also did this:

aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Also on the sound setting GUI. I have 2 hardware profiles for sound cards but none of them works when I test the speakers.

Where should I start searching ?