PCI/internal sound card not detected

[NeuroFox]

Description: Ubuntu 16.04.2 LTS
Release: 16.04

apt-cache policy pkgname
Unable to locate package pkgname

I'm new to Ubuntu.
On the start all was good with sound.
Wanted to install my original sound driver.
After trying to install realtek hd driver the Dummy audio appeared on my audio settings.
No sound. Then i tried to reinstall original driver - still no result. I have 0 sound card modules, and don't know how to return sound..
https://help.ubuntu.com/community/SoundTroubleshooting
Tried this guide but still, even after purge, it is not working.
Maybe its not a bug, just wrong settings, but still.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.8.0-52.55~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-52-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: Unity
Date: Wed May 24 04:06:12 2017
InstallationDate: Installed on 2017-05-23 (0 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/24/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X550CC.300
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X550CC
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550CC.300:bd03/24/2014:svnASUSTeKCOMPUTERINC.:pnX550CC:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550CC:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: X550CC
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2017-05-24T03:38:38.603132