Sometimes (1in30?) system boots with no sound.Usually OK. As if PCI/internal sound card not detected

Probably more a boot problem than a sound problem. Just sometimes doesn't happen. Never yet failed on a reboot. Either all there or nothing.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0c: paul 4045 F...m pulseaudio
 /dev/snd/pcmC0D0p: paul 4045 F...m pulseaudio
 /dev/snd/controlC0: paul 4045 F.... pulseaudio
 /dev/snd/controlC1: paul 4045 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Aug 24 19:57:24 2016
InstallationDate: Installed on 2016-06-15 (69 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
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: 12/22/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0915
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A785TD-M EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0915:bd12/22/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785TD-MEVO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer