LinuxQuestions.org - No sound / sound card not detected / dummy output

Hello guys,
this is my first post, and honestly I'm quite desperate, because ususally I can find the solution to my problems searching the forum, but not this time.
I can not tell when or how it happened, but my machine doesn't play a sound anymore. I've tried to re-install alsa, but it didn't solve my problem. I know the problem is not hardware related because before I began to re-install alsa I could see the device with "aplay -l". But after my attempts I lost the device, and now "aplay -l" just returns "No soundcards found".

Here's the output of alsa-info.sh:

!!################################
!!ALSA Information Script v 0.4.64
!!################################

!!Script ran on: Thu May 12 08:59:24 UTC 2016

!!Linux Distribution
!!------------------

Red Hat Enterprise Linux Workstation release 6.7 (Santiago) LSB_VERSION=base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarc
h:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch Red Hat Enterprise Linux Workstation release 6.7 (Sa
ntiago) Red Hat Enterprise Linux Workstation release 6.7 (Santiago)

!!DMI Information
!!---------------

Manufacturer: LENOVO
Product Name: 23501F9
Product Version: ThinkPad T430
Firmware Version: G1ET97WW (2.57 )

!!Kernel Information
!!------------------

Kernel release: 2.6.32-573.22.1.el6.x86_64
Operating System: GNU/Linux
Architecture: x86_64
Processor: x86_64
SMP Enabled: Yes

!!ALSA Version
!!------------

Driver version:
Library version: 1.1.1
Utilities version: 1.0.23

!!Loaded ALSA modules
!!-------------------

!!Sound Servers on this system
!!----------------------------

Pulseaudio:
Installed - Yes (/usr/bin/pulseaudio)
Running - Yes

Jack:
Installed - Yes (/usr/bin/jackd)
Running - No

!!Soundcards recognised by ALSA
!!-----------------------------

!!PCI Soundcards installed in the system
!!--------------------------------------

00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)

!!Advanced information - PCI Vendor/Device/Subsystem ID's
!!-------------------------------------------------------

00:1b.0 0403: 8086:1e20 (rev 04)
Subsystem: 17aa:21f3

!!Modprobe options (Sound related)
!!--------------------------------

snd-hda-intel: model=3stack
snd-hda-intel-model: index=0
snd-hda-intel: index=0 model=thinkpad

!!Loaded sound module options
!!---------------------------

!!ALSA Device nodes
!!-----------------

!!ALSA configuration files
!!------------------------

!!System wide config file (/etc/asound.conf)

#
# Place your global alsa-lib configuration here...
#

@hooks [
{
func load
files [
"/etc/alsa/pulse-default.conf"
]
errors false
}
]

!!Aplay/Arecord output
!!--------------------

APLAY

aplay: device_list:256: no soundcards found...

ARECORD

arecord: device_list:256: no soundcards found...

!!Amixer output
!!-------------

!!Alsactl output
!!--------------

--startcollapse--
--endcollapse--

!!All Loaded Modules
!!------------------

Module
xhci_hcd
vfat
fat
usb_storage
ctr
ccm
fuse
ip6_tables
ebtable_nat
ebtables
rfcomm
sco
bridge
bnep
l2cap
autofs4
8021q
garp
stp
llc
symap_rh_ES_6_2_6_32_431_el6_x86_64
symev_rh_ES_6_2_6_32_431_el6_x86_64
cpufreq_ondemand
acpi_cpufreq
freq_table
mperf
nf_conntrack_ftp
ipt_MASQUERADE
ipt_REDIRECT
iptable_nat
nf_nat
xt_CHECKSUM
iptable_mangle
xt_TCPMSS
ipt_LOG
xt_limit
ipt_REJECT
nf_conntrack_ipv4
nf_defrag_ipv4
xt_state
nf_conntrack
iptable_filter
ip_tables
vhost_net
macvtap
macvlan
tun
kvm_intel
kvm
uinput
thinkpad_acpi
arc4
iwldvm
mac80211
microcode
ipv6
iTCO_wdt
iTCO_vendor_support
iwlwifi
cfg80211
btusb
bluetooth
rfkill
uvcvideo
videodev
v4l2_compat_ioctl32
sg
i2c_i801
lpc_ich
mfd_core
soundcore
shpchp
e1000e
ptp
pps_core
ext4
jbd2
mbcache
drbg
aesni_intel
ablk_helper
cryptd
lrw
glue_helper
aes_x86_64
aes_generic
xts
gf128mul
dm_crypt
sd_mod
crc_t10dif
sr_mod
cdrom
sdhci_pci
sdhci
mmc_core
ahci
wmi
i915
drm_kms_helper
drm
i2c_algo_bit
i2c_core
video
output
dm_mirror
dm_region_hash
dm_log
dm_mod

!!ALSA/HDA dmesg
!!--------------

Can anyone take a look and give me some guindance? I'm not a newbie, and this is really the first time I'm kinda lost because I can not relate the loss of sound with any event, so I'm really shooting in the dark.

Thanks in advance to anyone that can give me a helping hand.