Come resettare i suoni in Yosemite 10.10.3

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1

In una versione precedente di OSX, la combinazione alt-cmd-P-R reenabled suona dopo un riavvio, ma non su Yosemite.

In alcune versioni di OSX, il comando sudo killall coreaudio funziona ma non in Yosemite 10.10.3 su un MacBook Air di metà 2013. Questo problema si è verificato anche in Yosemite 10.10.1 durante l'aggiornamento alla nuova versione. Sono riuscito a ottenere i suoni indietro dalle procedure di cui sopra.

Non vedo alcuna fonte audio nelle impostazioni audio dopo che questo problema è apparso, anche dopo questi due tentativi di risolvere questo problema.

ComeèpossibileripristinareisuoniinOSXYosemite10.10.3?

PossoottenereilsupportoAppleCaregratuitoseèl'unicasoluzione,dalmomentochehoun'assicurazionedi5anni.Tuttavia,nonvogliofarlosenonc'èaltrasoluzione.

Eventi23.5.2015

ApplehaportatonuoviaggiornamentisuAppStorechehannorisoltoilproblematemporaneamente(3ore):

Ho usato il mio Macbook Air 3 ore, sono andato in pausa e ho riaperto il Macbook - lo stesso problema è tornato. Non capisco davvero il motivo del bug OSX.

Il comando cd /System/Library/Extensions/AudioAUUC.kext ; ls -alt fornisce 

total 136
drwxr-xr-x  245 root  wheel   8330 May  3 12:06 ..
drwxr-xr-x    6 root  wheel    204 Apr 23 19:19 .
drwxr-xr-x    3 root  wheel    102 Apr 23 19:19 _CodeSignature
-rwxr-xr-x    1 root  wheel  57392 Mar 23 20:44 AudioAUUC
-rw-r--r--    1 root  wheel    473 Mar 23 20:44 version.plist
-rw-r--r--    1 root  wheel   2251 Mar 23 20:44 Info.plist

che sono piuttosto nuovi.

Il comando kextstat -b com.apple.driver.AudioAUUC fornisce 

Index Refs Address Size Wired Name (Version) <Linked Against>

che significa che la cosa audio non viene caricata come discusso con @danielAzuelos.

Il comando di Daniel /usr/bin/sudo kextutil -t -v 6 -b com.apple.driver.AudioAUUC fornisce 

Kext user-space log filter changed from 0xff2 to 0xfff.
Kext kernel-space log filter changed from 0xff2 to 0xfff.
Kext library architecture set to x86_64.
Can't stat /AppleInternal - No such file or directory.
Defaulting to kernel file '/System/Library/Kernels/kernel'
Kext library recording diagnostics for: validation authentication dependencies warnings.
/System/Library/Extensions/AudioAUUC.kext appears to be loadable (not including linkage for on-disk libraries).
Reading loaded kext info from kernel.
(kernel) User-space log flags changed from 0x0 to 0xfff.
(kernel) Received 'Get Loaded Kext Info' request from user space.
(kernel) Returning loaded kext info.
Loaded kext info:
{
}

Loading /System/Library/Extensions/AudioAUUC.kext.
Reading load info for 13 kexts.
Reading loaded kext info from kernel.
(kernel) User-space log flags changed from 0x0 to 0xfff.
(kernel) Received 'Get Loaded Kext Info' request from user space.
(kernel) Returning loaded kext info.
Loaded kext info:
{
"com.apple.kpi.bsd" = {
    "OSBundleWiredSize" = 35920
    "CFBundleIdentifier" = "com.apple.kpi.bsd"
    "OSBundleUUID" = <a0e026bd b5be44f7 8403a871 8d3dbaca>
    "OSBundleLoadAddress" = -551892557824
    "OSBundleLoadTag" = 1
    "OSBundleStarted" = true
    "OSBundleCompatibleVersion" = "8.0.0b1"
    "OSKernelResource" = true
    "CFBundleVersion" = "14.3.0"
    "OSBundlePath" = 
        "/System/Library/Extensions/System.kext/PlugIns/BSDKernel.kext"
    "OSBundleRetainCount" = 76
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = true
    "OSBundleLoadSize" = 35920
}
"com.apple.iokit.IOPCIFamily" = {
    "OSBundleWiredSize" = 192512
    "CFBundleIdentifier" = "com.apple.iokit.IOPCIFamily"
    "OSBundleStarted" = true
    "OSBundleCPUType" = 16777223
    "OSBundleCompatibleVersion" = "1.0.0b1"
    "OSBundleUUID" = <52e715fc 521d3869 b2ea5228 fa4bea34>
    "OSKernelResource" = false
    "CFBundleVersion" = "2.9"
    "OSBundleLoadTag" = 12
    "OSBundleLoadAddress" = -551891615744
    "OSBundleDependencies" = (
        4
        5
        3
        7
        6
    )
    "OSBundlePath" = "/System/Library/Extensions/IOPCIFamily.kext"
    "OSBundleRetainCount" = 27
    "OSBundleCPUSubtype" = 3
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = false
    "OSBundleLoadSize" = 192512
}
"com.apple.kpi.unsupported" = {
    "OSBundleWiredSize" = 18688
    "CFBundleIdentifier" = "com.apple.kpi.unsupported"
    "OSBundleUUID" = <6b59e72c 5a8a4f6f 9f1fac1a c266fc01>
    "OSBundleLoadAddress" = -551892578304
    "OSBundleLoadTag" = 7
    "OSBundleStarted" = true
    "OSBundleCompatibleVersion" = "8.0.0b1"
    "OSKernelResource" = true
    "CFBundleVersion" = "14.3.0"
    "OSBundlePath" = 
        "/System/Library/Extensions/System.kext/PlugIns/Unsupported.kext"
    "OSBundleRetainCount" = 59
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = true
    "OSBundleLoadSize" = 18688
}
"com.apple.kec.Libm" = {
    "OSBundleWiredSize" = 36864
    "CFBundleIdentifier" = "com.apple.kec.Libm"
    "OSBundleStarted" = true
    "OSBundleCPUType" = 16777223
    "OSBundleCompatibleVersion" = "1.0.0d0"
    "OSBundleUUID" = <a085de81 421e3818 b5aa3176 f8a9ee41>
    "OSKernelResource" = false
    "CFBundleVersion" = "1"
    "OSBundleLoadTag" = 10
    "OSBundleLoadAddress" = -551887593472
    "OSBundleDependencies" = (
        4
    )
    "OSBundlePath" = "/System/Library/Extensions/Libm.kext"
    "OSBundleRetainCount" = 1
    "OSBundleCPUSubtype" = 3
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = false
    "OSBundleLoadSize" = 36864
}
"com.apple.iokit.IOAudioFamily" = {
    "OSBundleWiredSize" = 196608
    "CFBundleIdentifier" = "com.apple.iokit.IOAudioFamily"
    "OSBundleStarted" = true
    "OSBundleCPUType" = 16777223
    "OSBundleCompatibleVersion" = "1.0"
    "OSBundleUUID" = <76e5591a b4953994 82c9d4af e7248acd>
    "OSKernelResource" = false
    "CFBundleVersion" = "203.3"
    "OSBundleLoadTag" = 104
    "OSBundleLoadAddress" = -551870152704
    "OSBundleDependencies" = (
        1
        4
        3
        103
        5
    )
    "OSBundlePath" = "/System/Library/Extensions/IOAudioFamily.kext"
    "OSBundleRetainCount" = 1
    "OSBundleCPUSubtype" = 3
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = false
    "OSBundleLoadSize" = 196608
}
"com.apple.iokit.IOACPIFamily" = {
    "OSBundleWiredSize" = 36864
    "CFBundleIdentifier" = "com.apple.iokit.IOACPIFamily"
    "OSBundleStarted" = true
    "OSBundleCPUType" = 16777223
    "OSBundleCompatibleVersion" = "1.0.0d1"
    "OSBundleUUID" = <70e2b65e a91a3522 a1a079fd 63eabb4c>
    "OSKernelResource" = false
    "CFBundleVersion" = "1.4"
    "OSBundleLoadTag" = 11
    "OSBundleLoadAddress" = -551882403840
    "OSBundleDependencies" = (
        6
        4
        3
        7
    )
    "OSBundlePath" = "/System/Library/Extensions/IOACPIFamily.kext"
    "OSBundleRetainCount" = 21
    "OSBundleCPUSubtype" = 3
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = false
    "OSBundleLoadSize" = 36864
}
"com.apple.kpi.iokit" = {
    "OSBundleWiredSize" = 132352
    "CFBundleIdentifier" = "com.apple.kpi.iokit"
    "OSBundleUUID" = <2ce5bfc8 851e42a0 89c2c72c 5fc0ed37>
    "OSBundleLoadAddress" = -551892799488
    "OSBundleLoadTag" = 3
    "OSBundleStarted" = true
    "OSBundleCompatibleVersion" = "7.0"
    "OSKernelResource" = true
    "CFBundleVersion" = "14.3.0"
    "OSBundlePath" = 
        "/System/Library/Extensions/System.kext/PlugIns/IOKit.kext"
    "OSBundleRetainCount" = 99
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = true
    "OSBundleLoadSize" = 132352
}
"com.apple.kpi.mach" = {
    "OSBundleWiredSize" = 11600
    "CFBundleIdentifier" = "com.apple.kpi.mach"
    "OSBundleUUID" = <25a0bcf1 1ba54d24 8bc20d3e ce0e2290>
    "OSBundleLoadAddress" = -551892811776
    "OSBundleLoadTag" = 5
    "OSBundleStarted" = true
    "OSBundleCompatibleVersion" = "8.0.0d0"
    "OSKernelResource" = true
    "CFBundleVersion" = "14.3.0"
    "OSBundlePath" = "/System/Library/Extensions/System.kext/PlugIns/Mach.kext"
    "OSBundleRetainCount" = 90
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = true
    "OSBundleLoadSize" = 11600
}
"com.apple.vecLib.kext" = {
    "OSBundleWiredSize" = 491520
    "CFBundleIdentifier" = "com.apple.vecLib.kext"
    "OSBundleStarted" = true
    "OSBundleCPUType" = 16777223
    "OSBundleCompatibleVersion" = "1.0.0d0"
    "OSBundleUUID" = <f806e076 fbc83e43 925ec85b dba433db>
    "OSKernelResource" = false
    "CFBundleVersion" = "1.2.0"
    "OSBundleLoadTag" = 103
    "OSBundleLoadAddress" = -551870644224
    "OSBundleDependencies" = (
        10
        4
        3
        6
        5
    )
    "OSBundlePath" = "/System/Library/Extensions/vecLib.kext"
    "OSBundleRetainCount" = 1
    "OSBundleCPUSubtype" = 3
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = false
    "OSBundleLoadSize" = 491520
}
"com.apple.kpi.private" = {
    "OSBundleWiredSize" = 34192
    "CFBundleIdentifier" = "com.apple.kpi.private"
    "OSBundleUUID" = <defc5a97 5f574cad b525506a eb855330>
    "OSBundleLoadAddress" = -551892615168
    "OSBundleLoadTag" = 6
    "OSBundleStarted" = true
    "OSBundleCompatibleVersion" = "8.0.0b1"
    "OSKernelResource" = true
    "CFBundleVersion" = "14.3.0"
    "OSBundlePath" = 
        "/System/Library/Extensions/System.kext/PlugIns/Private.kext"
    "OSBundleRetainCount" = 43
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = true
    "OSBundleLoadSize" = 34192
}
"com.apple.iokit.IOGraphicsFamily" = {
    "OSBundleWiredSize" = 241664
    "CFBundleIdentifier" = "com.apple.iokit.IOGraphicsFamily"
    "OSBundleStarted" = true
    "OSBundleCPUType" = 16777223
    "OSBundleCompatibleVersion" = "1.0.0b1"
    "OSBundleUUID" = <82ead591 67e339cb a232a809 5ca30e92>
    "OSKernelResource" = false
    "CFBundleVersion" = "2.4.1"
    "OSBundleLoadTag" = 77
    "OSBundleLoadAddress" = -551881777152
    "OSBundleDependencies" = (
        12
        4
        3
        7
        5
        1
    )
    "OSBundlePath" = "/System/Library/Extensions/IOGraphicsFamily.kext"
    "OSBundleRetainCount" = 11
    "OSBundleCPUSubtype" = 3
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = false
    "OSBundleLoadSize" = 241664
}
"com.apple.kpi.libkern" = {
    "OSBundleWiredSize" = 48976
    "CFBundleIdentifier" = "com.apple.kpi.libkern"
    "OSBundleUUID" = <7b658b96 3b784a9c 9a975c63 a8f653fe>
    "OSBundleLoadAddress" = -551892664320
    "OSBundleLoadTag" = 4
    "OSBundleStarted" = true
    "OSBundleCompatibleVersion" = "8.0.0d0"
    "OSKernelResource" = true
    "CFBundleVersion" = "14.3.0"
    "OSBundlePath" = 
        "/System/Library/Extensions/System.kext/PlugIns/Libkern.kext"
    "OSBundleRetainCount" = 104
    "OSBundlePrelinked" = true
    "OSBundleIsInterface" = true
    "OSBundleLoadSize" = 48976
}
}

/System/Library/Extensions/System.kext/PlugIns/BSDKernel.kext (version 14.3, UUID A0E026BD-B5BE-44F7-8403-A8718D3DBACA) is loaded.
/System/Library/Extensions/System.kext/PlugIns/BSDKernel.kext (version 14.3): is started.
setting load address of /System/Library/Extensions/System.kext/PlugIns/BSDKernel.kext to 0xffffff7f80a3e000
/System/Library/Extensions/IOACPIFamily.kext (version 1.4, UUID 70E2B65E-A91A-3522-A1A0-79FD63EABB4C) is loaded.
/System/Library/Extensions/IOACPIFamily.kext (version 1.4): is started.
setting load address of /System/Library/Extensions/IOACPIFamily.kext to 0xffffff7f813ed000
/System/Library/Extensions/System.kext/PlugIns/Libkern.kext (version 14.3, UUID 7B658B96-3B78-4A9C-9A97-5C63A8F653FE) is loaded.
/System/Library/Extensions/System.kext/PlugIns/Libkern.kext (version 14.3): is started.
setting load address of /System/Library/Extensions/System.kext/PlugIns/Libkern.kext to 0xffffff7f80a24000
/System/Library/Extensions/IOPCIFamily.kext (version 2.9, UUID 52E715FC-521D-3869-B2EA-5228FA4BEA34) is loaded.
/System/Library/Extensions/IOPCIFamily.kext (version 2.9): is started.
setting load address of /System/Library/Extensions/IOPCIFamily.kext to 0xffffff7f80b24000
/System/Library/Extensions/System.kext/PlugIns/IOKit.kext (version 14.3, UUID 2CE5BFC8-851E-42A0-89C2-C72C5FC0ED37) is loaded.
/System/Library/Extensions/System.kext/PlugIns/IOKit.kext (version 14.3): is started.
setting load address of /System/Library/Extensions/System.kext/PlugIns/IOKit.kext to 0xffffff7f80a03000
/System/Library/Extensions/System.kext/PlugIns/Mach.kext (version 14.3, UUID 25A0BCF1-1BA5-4D24-8BC2-0D3ECE0E2290) is loaded.
/System/Library/Extensions/System.kext/PlugIns/Mach.kext (version 14.3): is started.
setting load address of /System/Library/Extensions/System.kext/PlugIns/Mach.kext to 0xffffff7f80a00000
/System/Library/Extensions/IOAudioFamily.kext (version 203.3, UUID 76E5591A-B495-3994-82C9-D4AFE7248ACD) is loaded.
/System/Library/Extensions/IOAudioFamily.kext (version 203.3): is started.
setting load address of /System/Library/Extensions/IOAudioFamily.kext to 0xffffff7f81f9c000
/System/Library/Extensions/IOGraphicsFamily.kext (version 2.4.1, UUID 82EAD591-67E3-39CB-A232-A8095CA30E92) is loaded.
/System/Library/Extensions/IOGraphicsFamily.kext (version 2.4.1): is started.
setting load address of /System/Library/Extensions/IOGraphicsFamily.kext to 0xffffff7f81486000
/System/Library/Extensions/System.kext/PlugIns/Unsupported.kext (version 14.3, UUID 6B59E72C-5A8A-4F6F-9F1F-AC1AC266FC01) is loaded.
/System/Library/Extensions/System.kext/PlugIns/Unsupported.kext (version 14.3): is started.
setting load address of /System/Library/Extensions/System.kext/PlugIns/Unsupported.kext to 0xffffff7f80a39000
/System/Library/Extensions/System.kext/PlugIns/Private.kext (version 14.3, UUID DEFC5A97-5F57-4CAD-B525-506AEB855330) is loaded.
/System/Library/Extensions/System.kext/PlugIns/Private.kext (version 14.3): is started.
setting load address of /System/Library/Extensions/System.kext/PlugIns/Private.kext to 0xffffff7f80a30000
/System/Library/Extensions/vecLib.kext (version 1.2, UUID F806E076-FBC8-3E43-925E-C85BDBA433DB) is loaded.
/System/Library/Extensions/vecLib.kext (version 1.2): is started.
setting load address of /System/Library/Extensions/vecLib.kext to 0xffffff7f81f24000
/System/Library/Extensions/Libm.kext (version 1.0, UUID A085DE81-421E-3818-B5AA-3176F8A9EE41) is loaded.
/System/Library/Extensions/Libm.kext (version 1.0): is started.
setting load address of /System/Library/Extensions/Libm.kext to 0xffffff7f80efa000
Omitting loaded kext /System/Library/Extensions/System.kext/PlugIns/BSDKernel.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/System.kext/PlugIns/Unsupported.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/System.kext/PlugIns/IOKit.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/System.kext/PlugIns/Libkern.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/System.kext/PlugIns/Private.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/IOACPIFamily.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/System.kext/PlugIns/Mach.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/IOPCIFamily.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/Libm.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/vecLib.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/IOAudioFamily.kext from mkext for kernel load.
Omitting loaded kext /System/Library/Extensions/IOGraphicsFamily.kext from mkext for kernel load.
Adding /System/Library/Extensions/AudioAUUC.kext to mkext.
/System/Library/Extensions/AudioAUUC.kext added 57392-byte noncompressed executable to mkext.
Created mkext for architecture x86_64 containing 1 kexts.
Loading /System/Library/Extensions/AudioAUUC.kext.
(kernel) User-space log flags changed from 0x0 to 0xfff.
(kernel) Received kext load request from user space.
(kernel) Received request from user space to load kext com.apple.driver.AudioAUUC.
(kernel) Recorded kext com.apple.driver.AudioAUUC as a candidate for inclusion in prelinked kernel.
(kernel) Loading kext com.apple.driver.AudioAUUC.
(kernel) Kext com.apple.kpi.bsd is already loaded.
(kernel) Kext com.apple.iokit.IOACPIFamily is already loaded.
(kernel) Kext com.apple.iokit.IOACPIFamily sending 0 personality to the IOCatalogue and starting matching.
(kernel) Kext com.apple.kpi.libkern is already loaded.
(kernel) Kext com.apple.iokit.IOPCIFamily is already loaded.
(kernel) Kext com.apple.iokit.IOPCIFamily sending 3 personalities to the IOCatalogue and starting matching.
(kernel) Kext com.apple.kpi.iokit is already loaded.
(kernel) Kext com.apple.kpi.mach is already loaded.
(kernel) Kext com.apple.iokit.IOAudioFamily is already loaded.
(kernel) Kext com.apple.iokit.IOGraphicsFamily is already loaded.
(kernel) Kext com.apple.kpi.unsupported is already loaded.
(kernel) Allocated link buffer for kext com.apple.driver.AudioAUUC at 0xffffff7f9a203000 (28672 bytes).
(kernel) Kext com.apple.driver.AudioAUUC executable loaded; 7 pages at 0xffffff7f82a03000 (load tag 142).
(kernel) Kext com.apple.driver.AudioAUUC calling module start function.
(kernel) Kext com.apple.driver.AudioAUUC registered class AudioAUUCDriver.
(kernel) Kext com.apple.driver.AudioAUUC has IOService subclass AudioAUUCDriver; enabling autounload.
(kernel) Kext com.apple.driver.AudioAUUC registered class AudioAUUC.
(kernel) Kext com.apple.driver.AudioAUUC is now started.
(kernel) Kext com.apple.driver.AudioAUUC sending 1 personality to the IOCatalogue and starting matching.
(kernel) Kext com.apple.driver.AudioAUUC loaded.
Successfully loaded /System/Library/Extensions/AudioAUUC.kext.
/System/Library/Extensions/AudioAUUC.kext successfully loaded (or already loaded).

e vedo che il modulo non è caricato come output Index Refs Address Size Wired Name (Version) <Linked Against> del comando kextstat -b com.apple.driver.AudioAUUC .

Come puoi caricare questa cosa audio ora?

    
posta Léo Léopold Hertz 준영 17.05.2015 - 21:53
fonte

2 risposte

1

Dato che stiamo parlando di componenti molto rischiosi del kernel provenienti dal disco, la prima ipotesi per uccidere è un file system danneggiato.

  1. Controlla la partizione di avvio con Utility Disco.

    Se compaiono errori, riparali e riavvia.

  2. Verifica il problema di estensione:

    Riavvia il Mac senza estensioni: OS X Yosemite: avvia in modalità provvisoria

    Se non senti il suono del campanello di avvio, premi ⇧ shift 3 secondi dopo il pulsante di accensione. Tieni premuto finché non vedi la barra di progressione grigio scuro che mostra le estensioni, la riorganizzazione della cache e del kernel in corso.

    Controlla se l'audio è OK.

    Se sì, avvia la ricerca dell'estensione errata.

    In caso contrario, si è verificato un problema hardware. Porta il tuo Mac su Apple.

  3. Controlla l'estensione, la cache o il danneggiamento del kernel:

    Verifica se le estensioni del kernel audio sono effettivamente caricate: 

    kextstat | egrep 'Index|Audio'

    Dovresti ottenere un output molto simile (ma il campo indirizzo esadecimale) a questo: 

    $ kextstat | egrep 'Index|Audio'
Index Refs Address            Size       Wired      Name (Version) <Linked Against>
       95    4 0xffffff7f81603000 0x30000    0x30000    com.apple.iokit.IOAudioFamily (203.3) <94 5 4 3 1>
      196    0 0xffffff7f82c24000 0x5000     0x5000     com.apple.driver.AudioAUUC (1.70) <95 76 12 11 7 5 4 3 1>
$

    Se non hai queste 2 estensioni caricate, sfrutterai questa impostazione predefinita per caricarle in una modalità in cui vedrai cosa non funziona (ovvero cosa è solitamente nascosto dietro il bel pallone da spiaggia rotante ® ).

    Per ricaricare manualmente un'estensione mancante e approfittare di questa operazione manuale per capire meglio l'origine del cattivo, ecco come procedere: 

    /usr/bin/sudo kextutil -t -v 6 -b com.apple.driver.AudioAUUC

    che carica l'estensione del kernel com.apple.driver.AudioAUUC

    -b lo identifica con il nome del bundle,

    -t diagnostica di stampa,

    -v 6 sarà il più dettagliato possibile su ogni passaggio di questo processo.

    Alla fine di questo prolisso caricamento del kernel, controlla che il kernel abbia caricato questa estensione: 

    kextstat -b com.apple.driver.AudioAUUC
risposta data 23.05.2015 - 15:45
fonte
0

Potrebbe essere collegato all'hardware: collegare una cuffia al computer e assicurarsi che si connetta realmente. Disconnettilo e riavvia. Ho avuto un MacMini con audio difettoso e questo ha aiutato a farlo funzionare per un po '. Se non viene visualizzato il suono di avvio, riprova lo stesso, ma lascia collegare la cuffia. Prova con questo.

Nota: quando non viene visualizzato nessun avviso di avvio, probabilmente significa che l'hardware audio non può essere inizializzato e tutto ciò che è relativo al software non può cambiare nulla poiché il driver audio non ha alcuna connessione all'hardware.

    
risposta data 24.05.2015 - 11:05
fonte

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