Q: iMac in el capitan shuts down several times a day

These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.

Please launch the Console application in any one of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

In the Console window, select

          DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports

(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select

          View ▹ Show Log List

from the menu bar.

There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A panic report has a name that begins with "Kernel" and ends in ".panic". Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.

If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.

In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)

Please don’t post other kinds of diagnostic report.

I know the report is long, maybe several hundred lines. Please post all of it anyway.

When you post the report, you might see an error message on the web page: "You have included content in your post that is not permitted," or "The message contains invalid characters." That's a bug in the forum software. Please post the text on Pastebin, then post a link here to the page you created.

If you have an account on Pastebin, please don't select Private from the Paste Exposure menu on the page, because then no one but you will be able to see it.

Anonymous UUID:       8511A94F-0785-1660-D97D-1A3A947C5E0A

Thu Mar 31 13:26:47 2016

*** Panic Report ***

panic(cpu 0 caller 0xffffff7fa0be8bd5): "GPU Panic: [<None>] 3 3 7f 0 0 0 0 3 : NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0x0a2910de 0x00100000 0x00000000, BAR0 0xd2000000 0xffffff90c9157000 0x0a5480a2, D0, P2/4\n"@/Library/Caches/com.apple.xbs/Sources/AppleGraphicsControl/AppleGraphic sControl-3.12.6/src/AppleMuxControl/kext/GPUPanic.cpp:127

Backtrace (CPU 0), Frame : Return Address

0xffffff80b6ef3630 : 0xffffff801dadf792

0xffffff80b6ef36b0 : 0xffffff7fa0be8bd5

0xffffff80b6ef3790 : 0xffffff7f9e781fa4

0xffffff80b6ef3850 : 0xffffff7f9e84eadd

0xffffff80b6ef3890 : 0xffffff7f9e84eb48

0xffffff80b6ef3910 : 0xffffff7f9ead3a23

0xffffff80b6ef3a80 : 0xffffff7f9e872b79

0xffffff80b6ef3aa0 : 0xffffff7f9e788cfd

0xffffff80b6ef3b50 : 0xffffff7f9e786690

0xffffff80b6ef3d50 : 0xffffff7f9e787891

0xffffff80b6ef3e30 : 0xffffff7f9e72da24

0xffffff80b6ef3e90 : 0xffffff7fa0bb808a

0xffffff80b6ef3ee0 : 0xffffff7fa0bb6bc0

0xffffff80b6ef3f00 : 0xffffff801db13afa

0xffffff80b6ef3fb0 : 0xffffff801dbccf77

      Kernel Extensions in backtrace:

         com.apple.driver.AppleMuxControl(3.12.6)[44D361A1-4938-3AA5-9F73-9C909B66214B]@ 0xffffff7fa0bda000->0xffffff7fa0bedfff

            dependency: com.apple.driver.AppleGraphicsControl(3.12.6)[1654475C-9A4B-386C-AFA8-0A530194A 2F9]@0xffffff7fa0bd2000

            dependency: com.apple.iokit.IOACPIFamily(1.4)[5D7574C3-8E90-3873-BAEB-D979FC215A7D]@0xfffff f7f9e5b3000

            dependency: com.apple.iokit.IOPCIFamily(2.9)[F398CE94-0FBD-3E8E-A7AB-55F7F05A81ED]@0xffffff 7f9e32c000

            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[429C688E-8DDA-3D15-9C6E-6F3F4855C424]@0 xffffff7f9e6d4000

            dependency: com.apple.driver.AppleBacklightExpert(1.1.0)[70C85E35-16FC-3B76-A3B1-1862573201 3B]@0xffffff7fa0bd5000

         com.apple.nvidia.classic.NVDAResmanTesla(10.0)[05FC5D7E-BB0B-3232-BBBD-8A49B687 0D8B]@0xffffff7f9e72b000->0xffffff7f9e9a0fff

            dependency: com.apple.iokit.IOPCIFamily(2.9)[F398CE94-0FBD-3E8E-A7AB-55F7F05A81ED]@0xffffff 7f9e32c000

            dependency: com.apple.iokit.IONDRVSupport(2.4.1)[ED747668-8718-3FB4-A4F4-2AC731D5B16F]@0xff ffff7f9e71b000

            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[429C688E-8DDA-3D15-9C6E-6F3F4855C424]@0 xffffff7f9e6d4000

         com.apple.nvidia.classic.NVDANV50HalTesla(10.0)[56199CA6-3C8D-3EBB-B5EF-7B1B467 8ACF9]@0xffffff7f9e9ab000->0xffffff7f9ec58fff

            dependency: com.apple.nvidia.classic.NVDAResmanTesla(10.0.0)[05FC5D7E-BB0B-3232-BBBD-8A49B6 870D8B]@0xffffff7f9e72b000

            dependency: com.apple.iokit.IOPCIFamily(2.9)[F398CE94-0FBD-3E8E-A7AB-55F7F05A81ED]@0xffffff 7f9e32c000

         com.apple.driver.AGPM(110.20.22)[BA5158E0-87CC-3703-8F3F-228264BD7EDA]@0xffffff 7fa0bb5000->0xffffff7fa0bc8fff

            dependency: com.apple.iokit.IOPCIFamily(2.9)[F398CE94-0FBD-3E8E-A7AB-55F7F05A81ED]@0xffffff 7f9e32c000

            dependency: com.apple.driver.IOPlatformPluginFamily(6.0.0d7)[EC53D03F-6CD9-383A-8160-33E02C 141EAA]@0xffffff7f9f2e9000

            dependency: com.apple.iokit.IONDRVSupport(2.4.1)[ED747668-8718-3FB4-A4F4-2AC731D5B16F]@0xff ffff7f9e71b000

            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[429C688E-8DDA-3D15-9C6E-6F3F4855C424]@0 xffffff7f9e6d4000

            dependency: com.apple.AppleGraphicsDeviceControl(3.12.6)[F211EB28-182A-34BB-A610-87667618F9 25]@0xffffff7fa0bae000

BSD process name corresponding to current thread: kernel_task

Mac OS version:

15D21

Kernel version:

Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:xnu-3248.30.4~1/RELEASE_X86_64

Kernel UUID: DECC9F02-27D7-31F0-9599-A9EF2873902C

Kernel slide:     0x000000001d800000

Kernel text base: 0xffffff801da00000

__HIB  text base: 0xffffff801d900000

System model name: MacBookPro6,2 (Mac-F22586C8)

System uptime in nanoseconds: 7092006661362

last loaded kext at 3924817453753: com.apple.filesystems.exfat 1.4 (addr 0xffffff7fa0d04000, size 65536)

last unloaded kext at 5011725944166: com.apple.iokit.IOUSBMassStorageClass 4.0.2 (addr 0xffffff7fa0cef000, size 69632)

loaded kexts:

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AGPM 110.20.22

com.apple.filesystems.autofs 3.0

com.apple.iokit.IOBluetoothSerialManager 4.4.3f4

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleMikeyDriver 272.51.3

com.apple.driver.pmtelemetry 1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.driver.AppleHDA 272.51.3

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleIntelHDGraphics 10.0.0

com.apple.GeForceTesla 10.0.0

com.apple.driver.AppleHV 1

com.apple.driver.AppleMCCSControl 1.2.13

com.apple.driver.AppleIntelHDGraphicsFB 10.0.0

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.3f4

com.apple.driver.AppleSMCLMU 208

com.apple.driver.AppleMuxControl 3.12.6

com.apple.driver.AppleLPC 3.1

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.SMCMotionSensor 3.0.4d1

com.apple.driver.AppleUSBTCButtons 245.4

com.apple.driver.AppleUSBCardReader 3.7.1

com.apple.driver.AppleUSBTCKeyboard 245.4

com.apple.driver.AppleIRController 327.5

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.BootCache 38

com.apple.iokit.SCSITaskUserClient 3.7.7

com.apple.iokit.IOAHCIBlockStorage 2.8.5

com.apple.driver.AirPort.Brcm4331 800.20.24

com.apple.iokit.AppleBCM5701Ethernet 10.1.12

com.apple.driver.AppleFWOHCI 5.5.2

com.apple.driver.AppleAHCIPort 3.1.8

com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleACPIButtons 4.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 4.0

com.apple.driver.AppleAPIC 1.7

com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0

com.apple.nke.applicationfirewall 163

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleIntelCPUPowerManagement 218.0.0

com.apple.AppleGraphicsDeviceControl 3.12.6

com.apple.kext.triggers 1.0

com.apple.iokit.IOSerialFamily 11

com.apple.iokit.IOSurface 108.0.1

com.apple.driver.DspFuncLib 272.51.3

com.apple.kext.OSvKernDSPLib 525

com.apple.nvidia.classic.NVDANV50HalTesla 10.0.0

com.apple.nvidia.classic.NVDAResmanTesla 10.0.0

com.apple.driver.CoreCaptureResponder 1

com.apple.iokit.IOFireWireIP 2.2.6

com.apple.driver.AppleSMBusController 1.0.14d1

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.3f4

com.apple.iokit.IOBluetoothFamily 4.4.3f4

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.driver.AppleGraphicsControl 3.12.6

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.driver.AppleHDAController 272.51.3

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.iokit.IOHDAFamily 272.51.3

com.apple.iokit.IOAudioFamily 204.3

com.apple.vecLib.kext 1.2.0

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d7

com.apple.driver.AppleSMC 3.1.9

com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7

com.apple.iokit.IOUSBMassStorageDriver 1.0.0

com.apple.driver.AppleUSBMultitouch 250.5

com.apple.iokit.IOUSBHIDDriver 900.4.1

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1

com.apple.driver.usb.AppleUSBHub 1.0.1

com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.7

com.apple.iokit.IOBDStorageFamily 1.8

com.apple.iokit.IODVDStorageFamily 1.8

com.apple.iokit.IOCDStorageFamily 1.8

com.apple.iokit.IOAHCISerialATAPI 2.6.2

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.iokit.IO80211Family 1110.26

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IONetworkingFamily 3.2

com.apple.driver.corecapture 1.0.4

com.apple.iokit.IOFireWireFamily 4.5.8

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.iokit.IOAHCIFamily 2.8.1

com.apple.driver.usb.AppleUSBEHCI 1.0.1

com.apple.iokit.IOUSBHostFamily 1.0.1

com.apple.driver.AppleUSBHostMergeProperties 1.0.1

com.apple.driver.AppleEFINVRAM 2.0

com.apple.driver.AppleEFIRuntime 2.0

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 300.0

com.apple.kext.AppleMatch 1.0.0d1

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.DiskImages 417.2

com.apple.iokit.IOStorageFamily 2.1

com.apple.iokit.IOReportFamily 31

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 4.0

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.Libm 1

com.apple.kec.pthread 1

com.apple.kec.corecrypto 1.0

System Profile:

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.100.24)

Bluetooth: Version 4.4.3f4 16616, 3 services, 27 devices, 1 incoming serial ports

Thunderbolt Bus:

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353237334448302D4348392020

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: Card Reader

USB Device: Apple Internal Keyboard / Trackpad

USB Device: BRCM2070 Hub

USB Device: Bluetooth USB Host Controller

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: IR Receiver

USB Device: Built-in iSight

Serial ATA Device: TOSHIBA MK5065GSXF, 500.11 GB

Serial ATA Device: MATSHITADVD-R   UJ-8A8

Model: MacBookPro6,2, BootROM MBP61.0057.B11, 2 processors, Intel Core i5, 2.53 GHz, 4 GB, SMC 1.58f15

Network Service: Wi-Fi, AirPort, en1

Graphics: Intel HD Graphics, Intel HD Graphics, Built-In

Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB