TS4088 Intermittent black screens on my iMac 21.5 Mid 2011 os x 10.8.2, Help!
I get Intermittent black screens on my iMac 21.5 Mid 2011 os x 10.8.2, Help!
Try moving the com.apple.addressBook.plist to your Desktop and start Contacts.
To get there, hold down the Option key and select Library from the Go menu in Finder. Then, navigate to Preferences folder.
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IMac (27-inch, Mid 2011) Constantly Crashing to Black Screen, Has Troubles Rebooting
I have an iMac (27-inch, Mid 2011) with a 3.4 GHz quad-core Intel Core i7, 16GB RAM, and AMD Radeon HD 6970M 1GB of memory.
Every day since Tuesday, the computer has been randomly crashing once or twice a day to a black screen. It doesn't matter what I am doing (surfing the web in Safari, listening to music in iTunes, etc). If there is music playing, I will get a constant stutter of audio in addition to the black screen.
When restarting the computer, it instantly goes back to either a black or gray screen after the Apple logo passes. Attempting to reset the PRAM or SMC does not fix the issue from reoccuring and I usually have to keep the computer unplugged for an extended period of time before I can get it back up and running. Sometimes I have to boot the computer up into AHT (Apple Hardware Test) or Internet Recovery to get the computer running back to normal.
When running both a normal or extended AHT, all of the hardware that is tested ends up passing. When running Disk Utility, it shows there are no hard drive related issues.
The question that I have is this an issue related to the AMD Radeon 6970M Video Card?
Back in March, my iMac's display began suffering issues with greyish smudge marks behind the glass alongside issues where it would freeze and become distorted alongside the black screen. When I brought it into an Apple Authorized Service Provider back in March of this year to have everything checked out, they replaced the display and nothing else as they could not replicate any of the graphical issues despite numerous calls to AppleCare. I ended up doing an erase and install of Mavericks and the 10.9.2 update ended up being a temporary fix for the issue.
Should I call back AppleCare and tell them I need my video card replaced or is it something else?The last panic log was from 05/15/2014:
Thu May 15 14:19:02 2014
panic(cpu 3 caller 0xffffff800bfe3321): "mount_common(): mount of udf filesystem failed with 6, but vnode list is not empty."@/SourceCache/xnu/xnu-2422.100.13/bsd/vfs/vfs_syscalls.c:975
Backtrace (CPU 3), Frame : Return Address
0xffffff81f8f13700 : 0xffffff800be22fa9
0xffffff81f8f13780 : 0xffffff800bfe3321
0xffffff81f8f13ae0 : 0xffffff800bfe3e6d
0xffffff81f8f13f10 : 0xffffff800bfe3a09
0xffffff81f8f13f50 : 0xffffff800c240653
0xffffff81f8f13fb0 : 0xffffff800bef3c56
BSD process name corresponding to current thread: mount_udf
Mac OS version:
13D65
Kernel version:
Darwin Kernel Version 13.2.0: Thu Apr 17 23:03:13 PDT 2014; root:xnu-2422.100.13~1/RELEASE_X86_64
Kernel UUID: ADD73AE6-88B0-32FB-A8BB-4F7C8BE4092E
Kernel slide: 0x000000000bc00000
Kernel text base: 0xffffff800be00000
System model name: iMac12,2 (Mac-942B59F58194171B)
System uptime in nanoseconds: 11136484219679
last loaded kext at 7539731810245: com.apple.filesystems.udf 2.5 (addr 0xffffff7f8e64e000, size 262144)
last unloaded kext at 7793663834795: com.apple.driver.AppleIntelMCEReporter 104 (addr 0xffffff7f8e646000, size 32768)
loaded kexts:
com.cyberic.SmoothMouse 9
com.driver.LogJoystick 2.0
com.logitech.driver.LogiGamingMouseFilter 1
com.apple.filesystems.udf 2.5
com.apple.filesystems.afpfs 11.1
com.apple.nke.asp-tcp 8.0.1
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AudioAUUC 1.60
com.apple.driver.AppleBluetoothMultitouch 80.14
com.apple.driver.AGPM 100.14.15
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleMikeyDriver 2.6.1f2
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.iokit.IOBluetoothSerialManager 4.2.4f1
com.apple.driver.AppleUpstreamUserClient 3.5.13
com.apple.driver.AppleHDA 2.6.1f2
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleIntelHD3000Graphics 8.2.4
com.apple.kext.AMDFramebuffer 1.2.2
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.4f1
com.apple.driver.AppleBacklight 170.3.5
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.driver.AppleSMCPDRC 1.0.0
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleMCCSControl 1.1.12
com.apple.driver.AppleLPC 1.7.0
com.apple.driver.AppleIntelSNBGraphicsFB 8.2.4
com.apple.AMDRadeonX3000 1.2.2
com.apple.kext.AMD6000Controller 1.2.2
com.apple.driver.AppleThunderboltIP 1.1.2
com.apple.iokit.SCSITaskUserClient 3.6.6
com.apple.driver.AppleUSBCardReader 3.4.1
com.apple.driver.AppleIRController 325.7
com.apple.driver.Oxford_Semi 3.4.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.5.1
com.apple.driver.AppleUSBHub 666.4.0
com.apple.iokit.AppleBCM5701Ethernet 3.8.1b2
com.apple.driver.AppleFWOHCI 5.0.2
com.apple.driver.AirPort.Atheros40 700.74.5
com.apple.driver.AppleAHCIPort 3.0.0
com.apple.driver.AppleUSBEHCI 660.4.0
com.apple.driver.AppleACPIButtons 2.0
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 2.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 217.92.1
com.apple.nke.applicationfirewall 153
com.apple.security.quarantine 3
com.apple.driver.AppleIntelCPUPowerManagement 217.92.1
com.apple.security.SecureRemotePassword 1.0
com.apple.driver.AppleBluetoothHIDKeyboard 170.15
com.apple.driver.AppleHIDKeyboard 170.15
com.apple.driver.IOBluetoothHIDDriver 4.2.4f1
com.apple.driver.AppleMultitouchDriver 245.13
com.apple.kext.triggers 1.0
com.apple.iokit.IOSurface 91.1
com.apple.iokit.IOSerialFamily 10.0.7
com.apple.driver.DspFuncLib 2.6.1f2
com.apple.vecLib.kext 1.0.0
com.apple.iokit.IOAudioFamily 1.9.7fc2
com.apple.kext.OSvKernDSPLib 1.14
com.apple.iokit.IOBluetoothFamily 4.2.4f1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.4f1
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.driver.AppleHDAController 2.6.1f2
com.apple.iokit.IOHDAFamily 2.6.1f2
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.AppleSMBusController 1.0.11d1
com.apple.driver.IOPlatformPluginFamily 5.7.0d11
com.apple.iokit.IOAcceleratorFamily 98.20
com.apple.kext.AMDSupport 1.2.2
com.apple.AppleGraphicsDeviceControl 3.5.26
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.driver.AppleSMC 3.1.8
com.apple.driver.AppleThunderboltEDMSink 2.1.3
com.apple.iokit.IOAHCISerialATAPI 2.6.1
com.apple.driver.AppleThunderboltDPInAdapter 3.1.7
com.apple.driver.AppleThunderboltDPOutAdapter 3.1.7
com.apple.driver.AppleThunderboltDPAdapterFamily 3.1.7
com.apple.driver.AppleThunderboltPCIDownAdapter 1.4.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.6
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.6.6
com.apple.iokit.IOUSBMassStorageClass 3.6.0
com.apple.iokit.IOUSBHIDDriver 660.4.0
com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.6
com.apple.iokit.IOFireWireSBP2 4.2.6
com.apple.driver.AppleUSBMergeNub 650.4.0
com.apple.driver.AppleUSBComposite 656.4.1
com.apple.driver.AppleThunderboltNHI 2.0.1
com.apple.iokit.IOThunderboltFamily 3.2.7
com.apple.iokit.IOUSBUserClient 660.4.2
com.apple.iokit.IOEthernetAVBController 1.0.3b4
com.apple.driver.mDNSOffloadUserClient 1.0.1b5
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IO80211Family 630.35
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOAHCIFamily 2.6.5
com.apple.iokit.IOUSBFamily 677.4.0
com.apple.driver.AppleEFINVRAM 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 278.11
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 7
com.apple.driver.AppleKeyStore 2
com.apple.driver.DiskImages 371.1
com.apple.iokit.IOStorageFamily 1.9
com.apple.iokit.IOReportFamily 23
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 2.0
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.pthread 1
com.apple.kec.corecrypto 1.0
System Profile:
Model: iMac12,2, BootROM IM121.0047.B1F, 4 processors, Intel Core i7, 3.4 GHz, 16 GB, SMC 1.72f1
Graphics: AMD Radeon HD 6970M, AMD Radeon HD 6970M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x802C, 0x31364A53463531323634485A2D3147344431
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x802C, 0x31364A53463531323634485A2D3147344431
Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435435313236344243313333392E43313646
Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435435313236344243313333392E43313646
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0-P2P
Bluetooth: Version 4.2.4f1 13674, 3 services, 23 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST31000528AS, 1 TB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: External
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: G9x Laser Mouse
USB Device: IR Receiver
USB Device: Internal Memory Card Reader
FireWire Device: d2 quadra (button), LaCie, Up to 800 Mb/sec
Thunderbolt Bus: iMac, Apple Inc., 22.1
There was a crash posted on 05/29/2014:
Process: Nike+ Connect Helper Daemon [1146]
Path: /Applications/Nike+ Connect.app/Contents/MacOS/Nike+ Connect Helper Daemon
Identifier: Nike+ Connect Helper Daemon
Version: ???
Code Type: X86 (Native)
Parent Process: Nike+ Connect Helper Daemon [1142]
Responsible: Nike+ Connect Helper Daemon [1142]
User ID: 501
Date/Time: 2014-05-29 13:51:14.144 -0700
OS Version: Mac OS X 10.9.3 (13D65)
Report Version: 11
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x000000000000010c
VM Regions Near 0x10c:
--> __PAGEZERO 0000000000000000-0000000000001000 [ 4K] ---/--- SM=NUL /Applications/Nike+ Connect.app/Contents/MacOS/Nike+ Connect Helper Daemon
__TEXT 0000000000001000-0000000000003000 [ 8K] r-x/rwx SM=COW /Applications/Nike+ Connect.app/Contents/MacOS/Nike+ Connect Helper Daemon
Application Specific Information:
*** multi-threaded process forked ***
crashed on child side of fork pre-exec
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libdispatch.dylib 0x948e8444 _dispatch_wakeup + 113
1 libdispatch.dylib 0x948e8b08 _dispatch_resume_slow + 24
2 libcache.dylib 0x96f00467 _cache_init_globals + 211
3 libsystem_platform.dylib 0x9a566a86 _os_alloc + 90
4 libsystem_platform.dylib 0x9a5669b0 _os_once + 143
5 libsystem_platform.dylib 0x9a566a23 _os_alloc_once + 56
6 libcache.dylib 0x96efdf22 cache_create + 574
7 com.apple.CoreFoundation 0x9abe8352 -[NSCache init] + 130
8 libobjc.A.dylib 0x92bed47c +[NSObject new] + 52
9 com.apple.CoreFoundation 0x9ac0b995 __26+[__NSTimeZone initialize]_block_invoke + 37
10 libdispatch.dylib 0x948e7319 dispatch_once_f + 150
11 libdispatch.dylib 0x948e81bd dispatch_once + 31
12 com.apple.CoreFoundation 0x9ac0b965 +[__NSTimeZone initialize] + 53
13 libobjc.A.dylib 0x92bd7eb6 _class_initialize + 526
14 libobjc.A.dylib 0x92bddde1 lookUpImpOrForward + 109
15 libobjc.A.dylib 0x92bd7ca3 _class_lookupMethodAndLoadCache3 + 55
16 libobjc.A.dylib 0x92bd74e1 objc_msgSend + 81
17 com.apple.CoreFoundation 0x9ac10aa0 -[__NSPlaceholderTimeZone initWithName:] + 48
18 com.apple.CoreFoundation 0x9ac10a4b +[NSTimeZone timeZoneWithName:] + 59
19 com.apple.CoreFoundation 0x9ac10891 +[NSTimeZone systemTimeZone] + 849
20 com.apple.CoreFoundation 0x9ac10427 +[NSTimeZone defaultTimeZone] + 231
21 com.apple.CoreFoundation 0x9ac1031d CFTimeZoneCopyDefault + 45
22 com.apple.CoreFoundation 0x9ac101b0 CFCalendarCreateWithIdentifier + 544
23 com.apple.CoreFoundation 0x9ac275fc __CFLogCString + 124
24 com.apple.CoreFoundation 0x9ac2753e _CFLogvEx + 270
25 com.apple.Foundation 0x9a7dc5ca NSLogv + 137
26 com.apple.Foundation 0x9a7dc537 NSLog + 27
27 Nike+ Connect Helper Daemon 0x00002497 0x1000 + 5271
28 Nike+ Connect Helper Daemon 0x00002870 0x1000 + 6256
29 Nike+ Connect Helper Daemon 0x0000293c 0x1000 + 6460
30 Nike+ Connect Helper Daemon 0x00002a8d 0x1000 + 6797
31 Nike+ Connect Helper Daemon 0x0000242d 0x1000 + 5165
Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x00000100 ebx: 0x0052a41c ecx: 0x0052a404 edx: 0x00000002
edi: 0x0052a400 esi: 0xa0899500 ebp: 0xbffff238 esp: 0xbffff220
ss: 0x00000023 efl: 0x00010206 eip: 0x948e8444 cs: 0x0000001b
ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f
cr2: 0x0000010c
Logical CPU: 4
Error Code: 0x00000006
Trap Number: 14
Binary Images:
0x1000 - 0x2fff +Nike+ Connect Helper Daemon (???) <4C53F440-37C7-3352-B96E-789BE2BB27EA> /Applications/Nike+ Connect.app/Contents/MacOS/Nike+ Connect Helper Daemon
0x6000 - 0x6eff3 +libc++.dylib (1) <EFDC98D8-79DC-3E1E-A9E9-9360BEA8164C> /Applications/Nike+ Connect.app/Contents/MacOS/libc++.dylib
0x115000 - 0x13afff +libc++abi.dylib (0) <7B081EAD-646B-385E-AE9C-F5E56B4AF862> /Applications/Nike+ Connect.app/Contents/MacOS/libc++abi.dylib
0x1c6000 - 0x1d0ff7 com.apple.iokit.IOUSBLib (656.4.0 - 656.4.0) <45C969D5-3477-3785-9948-C892527E8B19> /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/IOUSBLib.bundle/Co ntents/MacOS/IOUSBLib
0x8fe0f000 - 0x8fe41417 dyld (239.4) <FF5ED937-CC28-3FEF-BCAF-750B1CDBAE36> /usr/lib/dyld
0x900c4000 - 0x900e8ff3 libc++abi.dylib (49.1) <43A04ACF-97A5-35ED-B454-6B5C0CF0F99D> /usr/lib/libc++abi.dylib
0x900f3000 - 0x900fcfff com.apple.DiskArbitration (2.6 - 2.6) <92F7575A-AA20-34D9-BB26-2CC8C3CCAFEB> /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
0x90eaf000 - 0x90eb0fff libsystem_blocks.dylib (63) <2AC67D5E-ECD4-3644-A53C-9684F9B7AA33> /usr/lib/system/libsystem_blocks.dylib
0x90f18000 - 0x90f68ff7 libcorecrypto.dylib (161.1) <135FD99E-2211-3DF4-825C-C9F816107F0C> /usr/lib/system/libcorecrypto.dylib
0x90f69000 - 0x90f70ffb libsystem_pthread.dylib (53.1.4) <8B1B7B84-1B5D-32A8-AC0D-1E689E5C8A4C> /usr/lib/system/libsystem_pthread.dylib
0x90f71000 - 0x90fc6fff libc++.1.dylib (120) <10C0A136-64F9-3CC2-9420-013247032120> /usr/lib/libc++.1.dylib
0x910b2000 - 0x910b4fff libsystem_configuration.dylib (596.15) <E49AAD29-35C2-3EE2-AF4D-59514C4B478F> /usr/lib/system/libsystem_configuration.dylib
0x91561000 - 0x91569fff libcopyfile.dylib (103) <1B1484BD-08B6-3BA9-94CA-A7C24B610EB3> /usr/lib/system/libcopyfile.dylib
0x916db000 - 0x916f3ff7 libsystem_malloc.dylib (23.10.1) <CB52555E-0F5B-31E3-A42A-FD4F930E2192> /usr/lib/system/libsystem_malloc.dylib
0x916fc000 - 0x9172dffa libsystem_m.dylib (3047.16) <28E614E8-7802-3E84-960A-AD4721EF10F7> /usr/lib/system/libsystem_m.dylib
0x91a28000 - 0x91a52fff libxslt.1.dylib (13) <249D54AB-1D82-38FE-ABEC-0D575450C73B> /usr/lib/libxslt.1.dylib
0x91b2b000 - 0x91c8dffb com.apple.CFNetwork (673.4 - 673.4) <3B6BDE2F-BFA3-3B7E-BC53-7B6B75EB12D3> /System/Library/Frameworks/CFNetwork.framework/Versions/A/CFNetwork
0x92417000 - 0x9241bff7 libmacho.dylib (845) <D8E93E59-1F80-3413-B9CF-78B848F6E873> /usr/lib/system/libmacho.dylib
0x9244f000 - 0x9244ffff libkeymgr.dylib (28) <1B097DEA-011E-3B1C-86D5-6C7FAD5C765A> /usr/lib/system/libkeymgr.dylib
0x92568000 - 0x925dbfff com.apple.SearchKit (1.4.0 - 1.4.0) <6F607AB6-7553-37BA-BEC5-98FD7C27FAD7> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchK it.framework/Versions/A/SearchKit
0x92a19000 - 0x92a90ffb com.apple.framework.IOKit (2.0.1 - 907.100.13) <D1308EE0-96AA-3442-A27B-264F58AE12B4> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x92bd3000 - 0x92d7b4af libobjc.A.dylib (551.1) <31CBE178-E972-30D1-ADC6-4B8345CAE326> /usr/lib/libobjc.A.dylib
0x939a9000 - 0x939b1fff libsystem_dnssd.dylib (522.90.2) <A73663C9-CE65-3FF3-B41B-686728BBFB00> /usr/lib/system/libsystem_dnssd.dylib
0x94164000 - 0x94465ffb com.apple.CoreServices.CarbonCore (1077.17 - 1077.17) <02C72D54-E3D3-32B0-A081-E85A7038489D> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonC ore.framework/Versions/A/CarbonCore
0x948e6000 - 0x948feffd libdispatch.dylib (339.92.1) <7E7A88BF-74B3-363B-B534-6F757DF2DDE3> /usr/lib/system/libdispatch.dylib
0x94959000 - 0x94984ff7 libsystem_network.dylib (241.3) <71EBA489-386D-3608-ADE6-CB50EBD1AB1B> /usr/lib/system/libsystem_network.dylib
0x94985000 - 0x94986fff libremovefile.dylib (33) <ED35EA79-EB06-3B84-A6D4-B1A9D6B8648D> /usr/lib/system/libremovefile.dylib
0x94adc000 - 0x94af4ff7 com.apple.CFOpenDirectory (10.9 - 173.90.1) <184471C6-C810-3346-B7C7-D86E695D0FA1> /System/Library/Frameworks/OpenDirectory.framework/Versions/A/Frameworks/CFOpen Directory.framework/Versions/A/CFOpenDirectory
0x954a7000 - 0x954cffff libsystem_info.dylib (449.1.3) <BB68E8CC-422F-3121-8C86-D0F766FB696D> /usr/lib/system/libsystem_info.dylib
0x95cc1000 - 0x95cc2ffd libunc.dylib (28) <22A126A1-DCFB-3BE5-A66B-C973F0A5D839> /usr/lib/system/libunc.dylib
0x95cc5000 - 0x95cc9ffc libpam.2.dylib (20) <50623D44-795F-3E28-AA85-23E0E7E2AE0E> /usr/lib/libpam.2.dylib
0x95dd1000 - 0x95ddfff7 libz.1.dylib (53) <858B4D9F-D87E-3D81-B07A-DF9632BD185F> /usr/lib/libz.1.dylib
0x95f89000 - 0x96064ff7 com.apple.LaunchServices (572.26 - 572.26) <5915A9AC-7928-30B1-9329-94048ADE81D9> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchS ervices.framework/Versions/A/LaunchServices
0x96b48000 - 0x96b4afff libquarantine.dylib (71) <EE3B510E-1AEC-3171-8A1A-D6A5A42CF35C> /usr/lib/system/libquarantine.dylib
0x96bab000 - 0x96bb1ffb libunwind.dylib (35.3) <099D1A6F-A1F0-3D05-BF1C-0A7BB32D39C2> /usr/lib/system/libunwind.dylib
0x96bb2000 - 0x96bb9ff2 com.apple.NetFS (6.0 - 4.0) <915AA303-C02B-3B0C-8208-D8AAA4350DB4> /System/Library/Frameworks/NetFS.framework/Versions/A/NetFS
0x96bdf000 - 0x96c77ff7 com.apple.Metadata (10.7.0 - 800.28) <D8C2153B-6D0F-3B75-97C7-742BDCA430FC> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadat a.framework/Versions/A/Metadata
0x96d15000 - 0x96d1dfff liblaunch.dylib (842.90.1) <B259692D-D60B-3BCE-9E03-32F457CB5046> /usr/lib/system/liblaunch.dylib
0x96e9e000 - 0x96efcffd com.apple.AE (665.5 - 665.5) <54F2F247-160C-3A22-A6E3-5D49655A67AB> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/AE.fram ework/Versions/A/AE
0x96efd000 - 0x96f01ffa libcache.dylib (62) <9730D7F2-D226-3F30-8D26-BF598CB781F6> /usr/lib/system/libcache.dylib
0x96f05000 - 0x96f17fff libsystem_asl.dylib (217.1.4) <51EB17C9-9F5B-39F3-B6CD-8EF238B05B89> /usr/lib/system/libsystem_asl.dylib
0x96f18000 - 0x96f1bff9 com.apple.TCC (1.0 - 1) <A5FCF7AA-3F56-3A19-9DF1-661F1F02F79D> /System/Library/PrivateFrameworks/TCC.framework/Versions/A/TCC
0x9701a000 - 0x97023fff libsystem_notify.dylib (121) <623269F5-1518-3035-A916-8AF83C972154> /usr/lib/system/libsystem_notify.dylib
0x97024000 - 0x97110ff7 libxml2.2.dylib (26) <32040145-6FD6-3AD2-B98B-39F73BF9AC47> /usr/lib/libxml2.2.dylib
0x974d2000 - 0x974eefff libCRFSuite.dylib (34) <FFF76EBA-DF35-3A5F-857F-3F4B1C9F4C77> /usr/lib/libCRFSuite.dylib
0x97707000 - 0x97708ffa libsystem_sandbox.dylib (278.11) <1A6276FC-9204-3A59-8024-2D572BA9D2F2> /usr/lib/system/libsystem_sandbox.dylib
0x97d46000 - 0x97d58fff libbsm.0.dylib (33) <1BE92DB5-0D2F-3BB5-BCC6-8A71EF2A3450> /usr/lib/libbsm.0.dylib
0x97d59000 - 0x97d7dff7 libxpc.dylib (300.90.2) <5ACBBE2C-74EB-3E88-BCBF-C573095318A5> /usr/lib/system/libxpc.dylib
0x9866e000 - 0x9875effb libiconv.2.dylib (41) <848FEBA7-2E3E-3ECB-BD59-007F32468787> /usr/lib/libiconv.2.dylib
0x98c88000 - 0x98c93ffb libcommonCrypto.dylib (60049) <F8E60C43-22EE-3E0B-9546-3365056901F1> /usr/lib/system/libcommonCrypto.dylib
0x98c94000 - 0x98da6ffc libsqlite3.dylib (158) <B3DB0FED-FE4C-314D-8329-CF7708C8AAF4> /usr/lib/libsqlite3.dylib
0x98dfe000 - 0x98e09ff6 com.apple.NetAuth (5.0 - 5.0) <3B2E9615-EE12-38FC-BDCF-09529FF9464B> /System/Library/PrivateFrameworks/NetAuth.framework/Versions/A/NetAuth
0x98e0b000 - 0x98e74ffa com.apple.datadetectorscore (5.0 - 354.4) <9B7B72AA-1DA4-327B-A714-5C710F3A33A0> /System/Library/PrivateFrameworks/DataDetectorsCore.framework/Versions/A/DataDe tectorsCore
0x990dc000 - 0x990e6fff com.apple.bsd.ServiceManagement (2.0 - 2.0) <B84F3916-236A-347B-9C1F-3DE571496737> /System/Library/Frameworks/ServiceManagement.framework/Versions/A/ServiceManage ment
0x990e7000 - 0x990eaff7 libdyld.dylib (239.4) <B2BD2222-2A51-39B7-BCC5-B8A4F36F900A> /usr/lib/system/libdyld.dylib
0x991b8000 - 0x991e4ff7 com.apple.DictionaryServices (1.2 - 208) <33873336-BECD-3F62-A315-C45F24C1818C> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Diction aryServices.framework/Versions/A/DictionaryServices
0x991e5000 - 0x99277ff9 libsystem_c.dylib (997.90.3) <80D21D3D-1031-314C-B1F0-0B35B977CEFB> /usr/lib/system/libsystem_c.dylib
0x9a18e000 - 0x9a18ffff liblangid.dylib (117) <F18F76C6-7E4B-34AD-AE81-C1C031BF2F7D> /usr/lib/liblangid.dylib
0x9a1d1000 - 0x9a1d2fff libDiagnosticMessagesClient.dylib (100) <B936B1D4-90BB-395D-8EA9-E1237608E7D0> /usr/lib/libDiagnosticMessagesClient.dylib
0x9a1d3000 - 0x9a1d3ffd libOpenScriptingUtil.dylib (157) <4D06E8ED-D312-34EA-A448-DFF45ADC3CE5> /usr/lib/libOpenScriptingUtil.dylib
0x9a563000 - 0x9a568ff3 libsystem_platform.dylib (24.90.1) <0613F163-9A7A-3908-B30B-AC1627503933> /usr/lib/system/libsystem_platform.dylib
0x9a569000 - 0x9a577fff libxar.1.dylib (202) <B73748D4-F830-3C71-98B3-7A3ABF5136FD> /usr/lib/libxar.1.dylib
0x9a6ef000 - 0x9a71fff7 com.apple.CoreServicesInternal (184.9 - 184.9) <999FEDEC-7657-3F32-A9AE-F29E0BE0AAF5> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/Versions/A/Cor eServicesInternal
0x9a77f000 - 0x9a77ffff com.apple.CoreServices (59 - 59) <06747539-5035-3307-8645-9BC4E7F89023> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
0x9a780000 - 0x9a78cffc libkxld.dylib (2422.100.13) <5C97CA53-F237-3ECC-9725-E71DDFEC661E> /usr/lib/system/libkxld.dylib
0x9a794000 - 0x9aabfffe com.apple.Foundation (6.9 - 1056.13) <C33A8984-7E97-36BE-B842-EE4FE35F53EA> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x9aac0000 - 0x9aafdff7 libauto.dylib (185.5) <CD008E66-4A0C-35F5-8D72-80D76A716A03> /usr/lib/libauto.dylib
0x9ab09000 - 0x9ab0eff6 libcompiler_rt.dylib (35) <9924DF2E-D80B-3A21-920D-544A4597203F> /usr/lib/system/libcompiler_rt.dylib
0x9ab12000 - 0x9ab7bfff com.apple.SystemConfiguration (1.13.1 - 1.13.1) <3AD9C90B-40A9-312B-B479-3AB178A96EA1> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfi guration
0x9ab7c000 - 0x9ad7efff com.apple.CoreFoundation (6.9 - 855.16) <6283B27F-3C46-365F-932C-1A7102D8A3CF> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x9b6b1000 - 0x9b731ff7 com.apple.CoreServices.OSServices (600.4 - 600.4) <382BE89A-9F37-3316-9AB8-DDEA691A80D1> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServi ces.framework/Versions/A/OSServices
0x9b732000 - 0x9b9a1ff6 com.apple.security (7.0 - 55471.14.4) <4C9E60A9-6861-3AFF-BEB8-637771FEC78B> /System/Library/Frameworks/Security.framework/Versions/A/Security
0x9b9a2000 - 0x9b9bfff4 libsystem_kernel.dylib (2422.100.13) <C09FD945-4F48-3322-AB4B-7D0243667657> /usr/lib/system/libsystem_kernel.dylib
0x9ba53000 - 0x9ba54fff libSystem.B.dylib (1197.1.1) <789CF4BE-5A0B-310E-9515-E515EA033D03> /usr/lib/libSystem.B.dylib
0x9be01000 - 0x9bfc7ffb libicucore.A.dylib (511.32) <9DC4CADF-6F5C-3D6F-A0FE-D8BC868915F2> /usr/lib/libicucore.A.dylib
0x9bfc8000 - 0x9bfd4ffc libbz2.1.0.dylib (29) <3CEF1E92-BA42-3F8A-8E8D-9E1F7658E5C7> /usr/lib/libbz2.1.0.dylib
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 2836
thread_create: 0
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=71.9M resident=36.6M(51%) swapped_out_or_unallocated=35.2M(49%)
Writable regions: Total=47.5M written=152K(0%) resident=460K(1%) swapped_out=0K(0%) unallocated=47.0M(99%)
REGION TYPE VIRTUAL
=========== =======
Kernel Alloc Once 4K
MALLOC 39.2M
MALLOC (admin) 32K
Stack 64.1M
VM_ALLOCATE 24K
__DATA 1516K
__LINKEDIT 44.2M
__OBJC 372K
__PAGEZERO 4K
__TEXT 27.6M
__UNICODE 544K
mapped file 211.4M
shared memory 4K
=========== =======
TOTAL 389.0M
System Profile:
Model: iMac12,2, BootROM IM121.0047.B1F, 4 processors, Intel Core i7, 3.4 GHz, 16 GB, SMC 1.72f1
Graphics: AMD Radeon HD 6970M, AMD Radeon HD 6970M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x802C, 0x31364A53463531323634485A2D3147344431
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x802C, 0x31364A53463531323634485A2D3147344431
Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435435313236344243313333392E43313646
Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435435313236344243313333392E43313646
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0-P2P
Bluetooth: Version 4.2.4f1 13674, 3 services, 23 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST31000528AS, 1 TB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: Hub
USB Device: G9x Laser Mouse
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: IR Receiver
USB Device: Internal Memory Card Reader
Thunderbolt Bus: iMac, Apple Inc., 22.1 -
Late 2007 MacBook Pro intermittent black screen
I have this very odd issue with an intermittent black screen on a late 2007 MacBook Pro (4GB/320GB 7200rpm) Mac OS X 10.6.8 v1.1
Apologies for the length of the post.
In cycles separated by a few days to a week, the screen will flicker to black, initially very briefly, then for longer periods until it is black continuously, where it stays from a few hours to a couple of days then it flickers to normal, again very briefly then with longer intervals until it is steady and normal. It can then be fine for a week or more.
When the screen is working, it's perfect; no lines, stripes, colour shift or any difference to what one would expect. When it is black, the backlight is still operational (and dimming when on battery power) but there is no image - all pixels are solid black. Shining a torch on/through the screen does not reveal any image. When mirrored, the external monitor shows the brightness adjustment moving up and down in response to the key presses but it has no effect on the internal screen.
My external display (Eizo) is always functional no matter what the built-in one is doing and is completely solid at all times.
There is no correlation to temperature (I have SMC fan control), sleep, restart, fan speed, power source or anything environmental. The MacBook is on a fan stand for most of the time. External connections make no difference. If the fault is present before changing any of these factors, it is there after.
I am aware that this machine has known vulnerabilities with GPU and display issues but none present quite like this. I have performed the usual trawl on the net and I now know more than I ever wanted to about attempts to fix it.
Software remedies attempted:
Resetting PRAM and power manager.
No sleep image file (never used this option). I deleted the old swap files that were there in any case but this unsurprisingly did nothing.
Resetting the display settings via keyboard commands or Sys Prefs.
Screen savers and settings are not implicated.
Nothing whatever in the console logs that I can see.
TechTool Pro gives video RAM a clean bill of health and all other components pass including tests on the HD with TTP and DiskWarrior.
Safe boot and booting from systems on backups seem to have no effect but one safe boot restored the screen briefly - I think it was a coincidence.
I updated the OS from 10.6.6 to 10.6.8 while this fault was coming and going and it made no difference. I usually prepare the machine for updates by running the cron jobs, repairing permissions etc.
In expectation of suffering this fault when the external monitor was not connected, I installed iScreen on the MacBook and use my iPad as a supplementary display and that works well too. Having all three operating, when the internal is functioning, is quite fun.
Hardware tests:
I removed the upper plate holding the keyboard and the interior of the machine was very clean with only some small dust accumulations in the fans, which were removed. There was no sign of any discolouration, corrosion, or other unpleasantness on the PCBs. All connectors and wiring looked good.
Every part of the logic board, cables and connectors were percussed, gently deflected and spray freezed, both while the fault was present and not (machine running) with no effect.
Display back was removed and the LCD board given the same treatment. No changes.
Display cable disconnected at both ends and tested for continuity (probe resistance accounted for) and consistency with a Fluke 87 multimeter - passed OK. On a scope, active signals and power were present on all the pins when the display was working but the fault did not occur during this test, which might have been interesting.
No apparent shorting of the display cable but without removing it this cannot be proved.
Problem not affected by hinge position, pressure on any part of the display, twisting, percussing etc.
Used compressed air to blow out the connectors which were reseated carefully.
After all this, the machine remains in exactly the same state, cycling between operational and black with various flickering stages as it comes and goes.
All I can deduce is that as the external monitor has always been OK, the GPU itself is probably working fine and the fault is more likely in the LCD panel electronics. I doesn't feel like a software issue to me but heck, I don't know what is going on.
Does anyone have any experience of something like this?
Thanks,
Joel.Thomas,
Thanks for your post and I'm sorry you have suffered the same problems.
My trust levels are not very high because it's clear there is some systemic display problem with this model, which is why Apple are fixing them. As I mentioned, we have no idea if the replacement boards are any different to the originals. From your experience it would look like they are not and my suspicion is that it is very unlikely that Apple made a new batch of these logic boards a long time after the model was discontinued. If anyone has evidence to the contrary, I stand to be corrected.
As you say, the difference between our two faults appears to be that a physical deformation of some part of the machine does something with yours but never did with mine. At one point I felt that a short in the internal display cable seemed like the best explanation for the problem but it looks like it's more complex than that because of the behaviour of our external displays and subsequent strange booting behaviour.
If, as I have read, the soldering of the GPU was faulty and leads to progressive failure of the graphics sub-system, then all kinds of strange behaviours could arise and produce the intermittent problems we have seen. Micro-fractures of the chip interconnects would suggest that tiny movements might change the presentation of the fault. If soldering really is the issue, then keeping the machine as cool as possible will extend the life of the connections. Consequently mine will sit on a fan-stand for the rest of its days, which is no problem because it just had Win 7 installed on it and I don't want to be seen in public with it in that state ;-)
All we can conclude is that a logic board swap fixes the problem for some indeterminate period, so the problem is on that board. Whether it is a design fault with the NVIDIA chip itself or a manufacturing fault with the board is not clear but we can probably forget LCD panels, cables, sleep issues, power supplies and all the other peripheral issues unless there is yet another design issue that causes the GPU to fail.
Are you intending to present your machine to Apple for another go at a fix? -
HT1338 MacBook Pro (15-inch, Mid 2010): Intermittent black screen or loss of video
runing mac os x
verison 10.7.4
Macbook Pro (15- inch Mid 2010 )
issue Intermittent black screen or loss of videoI had same problem.
After installing, respectively Mountain Lion and Lion, the same error came again in both instalations. I tryed to replace the hard disk, and installed again, but the same error came up.
BUT now have two days running with Windows 8 on it and it run perfectly. I installed from boot camp and has not opened OX again.
So it is quite obvious that Apple has fixed it well enough. Windows cant haddel hardware issue better. -
MacBook Pro (15-inch, Mid 2010) intermittent black screen or loss of video. Can I still get this problem resolve by Apple or I'm screwed because the MacBook Pro (15-inch, Mid 2010) intermittent black screen or loss of video Quality Program has ended?
You can have Apple replace the logic board, but it will be at your expense. The free replacement program has ended.
As a band aid you may try the following:
https://gfx.io/
This will allow you to run on only the integrated GPU.
Ciao. -
I've been getting an intermittant black screen. It's almost as if going to a hot corner for about 2 seconds and then moving the mouse. Most of the time I get the black screen I'm on the internet or playing solitare so I know the pointer is not in the hot corner. I've even turned the hot corners off to no avail. I've checked the dvi cable.
I'm using dvi port 1 with the little dvi extension to dvi cable that came with my 19 inch viewsonic.Okay, I see alot of simular issues with a lot of different screens with both ati and nvidia cards so, I guess it's a problem with compatability. I don't see any complaining about flickering or blank screens with the apple monitor. Has anyone heard from Apple if there is a solution? I'm not about to dish out 600 bucks for the Apple monitor. Does anyone have a generic monitor that does not flicker?
-
I installed Mountain Lion in my IMac and now, some times, when I start up my mac it looks with a black screen and white text. I'm really worry about it, can somebody help me?
Don't worry, this is probably just Verbose Mode. It's perfectly harmless. If you're not specifically invoking it, than it's probably down to an unwanted setting in NVRAM. See this article on resetting NVRAM if it continues to bother you.
-
My ipod has just black screen and the home button is not working. what will i do? help please!
my ipod has just black screen and the home button is not working. what will i do? help please!
Try:
- iOS: Not responding or does not turn on
When it says place the iPodin recovery mode use this prgram.
RecBoot: Easy Way to Put iPhone into Recovery Mode
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar -
hello I have imac (27-inch mid 2011) 3.1ghz intel core i5 1tb serial ata hard drive, amd radeon hd 6970m
my problem is
imac works fine in safe mode,
but when you try to startup normal it's connstantly restart by it self.in safe mode works perfectly,soon as I try to boot in normal mode it's keep restarting.on screen I don't see any line vertical or horizontal picture look normal on safe mode.but unable to start normal it just restarting over and over.I try another HDD but same things happen,I replace memory but still same.works ok in safe mode but not in normal mode.I will try to post system error report.
-
iMac (27-inch, Mid 2011) 2.7 GHz Intel Core i5 4 GB 1333 MHz DDR3 running10.10.2 (14C1514). Trying to install Windows 7 64 bit from an install disc. When attempting to create an ISO image I can save the file in disk utility but can convert cdr to iso. I select the file and the hit return as in step 8 of the Creating an
iSO image document but the box that should open to select use iso does not open. How should I proceed?The Mac SuperDrive built into your Mac is the Optical drive.
1. Insert your Windows DVD in Optical drive. Disconnect any external storage.
2. Insert a USB2 Flash drive. This will be used to hold the BC drivers.
3. Start BCA. Check the options to download software and Install Windows. You do not need to download Windows. The BCA will download the BC drivers to the USB.
4. Partition your drive.
5. You can see the Windows installer screens at https://help.apple.com/bootcamp/mac/5.0/help/#/bcmp173b3bf2. -
Problem installing windows 7 on imac 27" i7 mid 2011
I myself have a 27" i5 mid 2010 model but a friend of mine recently got a 27'' i7 he wanted to instal windows 7 because he also uses other software aswell
Specs of his iMac 27'' :
Thunderbolt
HD Facetime Camera
4gig of memory
2gig videocard
1T HDD
OsX 10.7 Lion completly updated
Oke here is my and his story/problem:
I start bootcamp download the software i need too install bootcamp on windows 7 Ultimate.
After that i create a partition 200 gig for windows 7 Ultimate. i click on the button to start the install.
After the restart i press enter and the windows setup starts after some clicks i format the bootcamp partition as explained by apple in there support.
I click on install windows start to install after the first boot it wil compleet the install normally this wil install the drivers and you get normal resolution ect,
this doesn't happend. It keeps the big chunky resolution. so that tells me that the drivers aren't installed.
After windows compleets the installation it restarts does a video test, and brings us to the screen where you need to fill in your name and password then windows asked a few things and the world time ect, and when you click on done or compleet. Normally you will get something like this (Please wait a moment windows is preparing your desktop) instead of that the mac restarts, (but the windows dvd is still in the superdrive because you cant get it out) it asked me if i want to press a button to instal windows no i wont, so i wait it counts down so it wil start up windows. now here is the problem it doesnt startup to windows it hangs and does nothing.
I my self have a mid 2010 27'' i5 model and had a blank screen everytime i tryed to instal windows 7 ultimate, i learned that there was a download available where you can create a MBRFAT USB stick where you copy a .xml file and a driver map so windows got the right drivers for my model so it would install succefully,here a link http://support.apple.com/kb/TS3173 where i found it.
Is there something like this available for the
iMac 27'' model mid 2011
with a 2gig videocard
Thunderbolt
HD facetime camera
4gig memory
10.7 Lion
Any help or links would be niceOke we are still fighting with this after finished installing windows 7 hangs problem!
My question now is can this problem as mentiond above be caused by plugged in USB devices he also uses a world of warcraft mouse and a logitech keyboard G19 version that can be used with world of warcraft.
He also he got a Sitecom powered USB hub 10 port, and uses 2 WD elements external USB HDD 2Terra connected to the hub that uses 1 port on the mac the other 2 on the mac are the keyboard and mouse that he uses for world of warecraft and there is 1 left on the mac that he uses for his iphone or usb stick.
We are also looking for the new drivers for the i7 mid/late 2011 models so that have a AMD Radeon HD 6970M with 2 GB GDDR5 installed so windows can be installed correctly?
Thanks for any help on this matter.. -
The display brightness of my iMac 21.5 (mid 2011, with ATI Radeon 6770M) can't be adjusted in Windows 7 installed under Bootcamp 4. I tried moving the brightness glider either with apple keyboard hotkeys (on-screen glider), or within Windows control panel brightness control (within the power option), but the brightness remains the same. I've had all software (Lion, bootcamp, windows 7) up to date. Please help. Thanks.
I posted a similar case to yours a month ago and it seems we're in a minority on the problem. What I have learned over this month was that Bootcamp drivers version 4 (Designed around OS Lion) was a BIG part of my issue with the ATI video. The new IMacs seems to require a customized by Apple Verion 3.2 or 3.3 to operate normally. Sadly, it's not as easy as just backing off version 4 and going onto 3.2 and getting the video slider back. You need to reload Windows and avoid Bootcamp 4.0 as it seems a piece of V4 gets stuck in Windows. I'm putting this suggestion to practise this week, guess I'll have more to say later.
Pete -
Frustratingly, since I upgraded to Yosemite 10.10, I too am having the worst problems with WiFi dropping out. I've never had this problem before on my iMac 27-inch mid 2011 model. Turning WiFi off and then back on again sometimes works. Help please. I've already tried a lot of your suggested fixes, but without success. Why hasn't Apple Fixed this?
Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.
Step 1
Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 2
Disconnect all USB 3 devices. If you don't know which are USB 3, disconnect all USB devices except keyboard and mouse.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.
Step 4
Open the Energy Saver pane in System Preferences and unlock the settings, if necessary. Select the Power Adapter tab, if there is one. Uncheck the box marked
Wake for Wi-Fi network access
if it's checked.
Step 5
Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.
Step 6
In the Wi-Fi settings, select
Advanced... ▹ TCP/IP ▹ Configure IPv6: Link-local
Click OK and then Apply.
Step 7
Reset the System Management Controller.
Step 8
Reset the PRAM.
Step 9
Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
Step 10
Make a "Genius" appointment at an Apple Store, or go to another authorized service center. -
IMac 21.5" - 'Mid 2011' - Lion - Option key problem
Hello, I just bought an IMac 21.5" - 'Mid 2011' - Lion. It's wireless.
I'd like to start up the computer using an external HD. I know that I should hit the option key to present the choices.
This does not work from rebooting, it only functions when I turn off the machine, wait 20 seconds & hit the 'turn on' button again.
Also, I've noticed that if I go into the Apple Help menu & type 'Pram' nothing comes up. In an older MBP, also using Lion, I get a list of choices. I would also like to know if this normal behavior ?
Thanks for any feedback.I wasn't talking about zapping the pram; your solution to the 1st part of the problem was perfect - thanks again.
I was referring to the Apple Help system. I would like to know if it changed.
In my MBP when I type 'pram' in the help area, I get a list of topics. In the new IMac, nothing comes up !
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