HT1338 why does my imac keep making a noise every 30 seconds when I am not using it?

My iMac keeping making a sound (sort of a clicking sound) every 30 seconds when I am not using it. It is very annoying; is therre a way to stop it?

Bring it in to service, and ask them to tell you what the noise is.  Sometimes it just is the optical drive realigning itself.   It could be the sign of a dying hard drive.  Only they can tell the difference.

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    Hi,
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    Console:
    8/11/2014 2:00:06.648 am powerd[26]: com.apple.message.domain: com.apple.iokit.wakereasons
    com.apple.message.signature: Maintenance
    com.apple.message.signature2: unsupported
    com.apple.message.signature3: Maintenance
    com.apple.message.summarize: YES
    SenderMachUUID: 1F97CC0A-F1D6-3A56-BA08-E644AD7CCF82
    8/11/2014 2:00:11.046 am UserEventAgent[302]: com.apple.message.domain: com.apple.bluetooth.interval
    com.apple.message.power: AC Power
    com.apple.message.system: Sleep
    com.apple.message.lid: None
    com.apple.message.bluetooth: On
    com.apple.message.wifi: OFF
    com.apple.message.connections: 2
    com.apple.message.types: 000000AC
    com.apple.message.duration: 360
    SenderMachUUID: 58CE43F8-5A2C-39D3-A9A2-94E048245A34
    8/11/2014 2:00:11.301 am airportd[29]: com.apple.message.domain: com.apple.wifi.optimized-autojoin
    com.apple.message.type: normal
    com.apple.message.result: success
    com.apple.message.error: no error
    com.apple.message.wake_type: dark
    com.apple.message.collocated: no
    com.apple.message.bluetooth_paging: no
    com.apple.message.scanned_channel_count: 33
    com.apple.message.retry: no
    com.apple.message.preferred_networks_count: 3
    com.apple.message.legacy: yes
    com.apple.message.association_security_type: wpa2 personal
    com.apple.message.scan_duration: 3.7
    com.apple.message.gas_duration: 0
    com.apple.message.association_duration: 0.3
    com.apple.message.duration: 4
    SenderMachUUID: 1487FFF4-8AF9-38D4-B8B0-F8EC8D4606D9
    8/11/2014 2:01:59.521 am airportd[29]: SCPreferences(com.apple.framework.CoreWLAN:com.apple.airport.preferences.plist) lock held for 6.507 seconds
    com.apple.message.domain: com.apple.SystemConfiguration.SCPreferencesUnlock
    com.apple.message.signature: com.apple.framework.CoreWLAN
    com.apple.message.signature2: com.apple.airport.preferences.plist
    com.apple.message.value: 6.507
    SenderMachUUID: 1487FFF4-8AF9-38D4-B8B0-F8EC8D4606D9
    8/11/2014 2:01:59.663 am powerd[26]: com.apple.message.domain: com.apple.iokit.wakereasons
    com.apple.message.signature: Maintenance
    com.apple.message.signature2: unsupported
    com.apple.message.signature3: Maintenance
    com.apple.message.summarize: YES
    SenderMachUUID: 1F97CC0A-F1D6-3A56-BA08-E644AD7CCF82
    8/11/2014 2:02:03.546 am CalendarAgent[348]: com.apple.message.domain: com.apple.calendar.account_refresh_2
    com.apple.message.result: fail
    com.apple.message.signature: NSURLErrorDomain:-1009
    com.apple.message.signature2: com.apple.account.icloud
    com.apple.message.summarize: YES
    SenderMachUUID: B4A6E7BD-880A-3F93-A04D-0C40E8689AC8
    8/11/2014 2:02:03.694 am airportd[29]: com.apple.message.domain: com.apple.wifi.optimized-autojoin
    com.apple.message.type: normal
    com.apple.message.result: success
    com.apple.message.error: no error
    com.apple.message.wake_type: user
    com.apple.message.collocated: no
    com.apple.message.bluetooth_paging: no
    com.apple.message.scanned_channel_count: 33
    com.apple.message.retry: no
    com.apple.message.preferred_networks_count: 3
    com.apple.message.legacy: yes
    com.apple.message.association_security_type: wpa2 personal
    com.apple.message.scan_duration: 3.7
    com.apple.message.gas_duration: 0
    com.apple.message.association_duration: 0.44
    com.apple.message.duration: 4.2
    SenderMachUUID: 1487FFF4-8AF9-38D4-B8B0-F8EC8D4606D9
    8/11/2014 2:03:53.508 am airportd[29]: SCPreferences(com.apple.framework.CoreWLAN:com.apple.airport.preferences.plist) lock held for 6.496 seconds
    com.apple.message.domain: com.apple.SystemConfiguration.SCPreferencesUnlock
    com.apple.message.signature: com.apple.framework.CoreWLAN
    com.apple.message.signature2: com.apple.airport.preferences.plist
    com.apple.message.value: 6.496
    SenderMachUUID: 1487FFF4-8AF9-38D4-B8B0-F8EC8D4606D9
    8/11/2014 2:03:53.644 am powerd[26]: com.apple.message.domain: com.apple.iokit.wakereasons
    com.apple.message.signature: Maintenance
    com.apple.message.signature2: unsupported
    com.apple.message.signature3: Maintenance
    com.apple.message.summarize: YES
    SenderMachUUID: 1F97CC0A-F1D6-3A56-BA08-E644AD7CCF82
    8/11/2014 2:03:57.492 am airportd[29]: com.apple.message.domain: com.apple.wifi.optimized-autojoin
    com.apple.message.type: normal
    com.apple.message.result: success
    com.apple.message.error: no error
    com.apple.message.wake_type: user
    com.apple.message.collocated: no
    com.apple.message.bluetooth_paging: no
    com.apple.message.scanned_channel_count: 33
    com.apple.message.retry: no
    com.apple.message.preferred_networks_count: 3
    com.apple.message.legacy: yes
    com.apple.message.association_security_type: wpa2 personal
    com.apple.message.scan_duration: 3.7
    com.apple.message.gas_duration: 0
    com.apple.message.association_duration: 0.25
    com.apple.message.duration: 4
    SenderMachUUID: 1487FFF4-8AF9-38D4-B8B0-F8EC8D4606D9
    8/11/2014 2:05:46.523 am airportd[29]: SCPreferences(com.apple.framework.CoreWLAN:com.apple.airport.preferences.plist) lock held for 6.511 seconds
    com.apple.message.domain: com.apple.SystemConfiguration.SCPreferencesUnlock
    com.apple.message.signature: com.apple.framework.CoreWLAN
    com.apple.message.signature2: com.apple.airport.preferences.plist
    com.apple.message.value: 6.511
    SenderMachUUID: 1487FFF4-8AF9-38D4-B8B0-F8EC8D4606D9
    Terminal:
    Nov  7 04:26:54 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  7 04:28:47 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  7 04:30:40 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  7 06:19:31 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  7 08:08:22 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  7 08:51:06 BiMac-13 kernel[0] <Notice>: Wake reason: EHC1
    Nov  8 02:00:00 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:01:53 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:03:47 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:05:40 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:07:33 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:09:28 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:11:21 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:13:14 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:15:07 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:17:00 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:18:53 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:20:46 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:22:39 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:24:34 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:26:27 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:28:22 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:30:14 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:32:07 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:34:00 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:35:53 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:37:46 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:39:39 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:41:32 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:43:25 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:45:18 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:47:11 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:49:04 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:50:57 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:52:50 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:54:43 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:56:36 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 02:58:29 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:00:22 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:02:15 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:04:08 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:06:01 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:07:54 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:09:47 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:11:40 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:13:33 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:15:26 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:17:19 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:19:12 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:21:05 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:22:58 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:24:51 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:27:52 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)
    Nov  8 03:29:45 BiMac-13 kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
    Feedback
    Mail/Provide Mail Feedback
    Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
    Feedback via Apple Developer

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    0xffffff83e404bcc0 : 0xffffff80204c5490
    0xffffff83e404bda0 : 0xffffff80204c5db7
    0xffffff83e404be00 : 0xffffff802047e0ca
    0xffffff83e404bf10 : 0xffffff802048239f
    0xffffff83e404bf40 : 0xffffff802041d177
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    com.apple.filesystems.smbfs 2.0.2
    com.apple.driver.AppleBluetoothMultitouch 80.14
    com.apple.driver.AudioAUUC 1.60
    com.apple.driver.AppleHWSensor 1.9.5d0
    com.apple.iokit.IOBluetoothSerialManager 4.2.4f1
    com.apple.filesystems.autofs 3.0
    com.apple.driver.AppleMikeyHIDDriver 124
    com.apple.driver.AppleMikeyDriver 2.6.1f2
    com.apple.driver.AGPM 100.14.15
    com.apple.driver.ApplePlatformEnabler 2.0.9d1
    com.apple.driver.X86PlatformShim 1.0.0
    com.apple.driver.AppleHDA 2.6.1f2
    com.apple.iokit.IOUserEthernet 1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X 7.0.0
    com.apple.driver.AppleIntelHD4000Graphics 8.2.6
    com.apple.driver.AppleHWAccess 1
    com.apple.driver.AppleUpstreamUserClient 3.5.13
    com.apple.driver.AppleLPC 1.7.0
    com.apple.GeForce 8.2.6
    com.apple.driver.AppleIntelFramebufferCapri 8.2.6
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.4f1
    com.apple.driver.AppleBacklight 170.3.5
    com.apple.driver.AppleMCCSControl 1.1.12
    com.apple.driver.AppleSMCLMU 2.0.4d1
    com.apple.driver.AppleThunderboltIP 1.1.2
    com.apple.iokit.SCSITaskUserClient 3.6.6
    com.apple.driver.AppleUSBODD 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.driver.AppleSDXC 1.5.2
    com.apple.iokit.AppleBCM5701Ethernet 3.8.1b2
    com.apple.driver.AirPort.Brcm4331 700.20.22
    com.apple.driver.AppleAHCIPort 3.0.0
    com.apple.driver.AppleUSBEHCI 660.4.0
    com.apple.driver.AppleUSBXHCI 677.4.0
    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.driver.IOBluetoothHIDDriver 4.2.4f1
    com.apple.driver.AppleMultitouchDriver 245.13
    com.apple.iokit.IOSerialFamily 10.0.7
    com.apple.kext.triggers 1.0
    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.IOSurface 91.1
    com.apple.driver.X86PlatformPlugin 1.0.0
    com.apple.driver.AppleSMBusPCI 1.0.12d1
    com.apple.driver.IOPlatformPluginFamily 5.7.0d11
    com.apple.iokit.IOAcceleratorFamily 98.20
    com.apple.nvidia.driver.NVDAGK100Hal 8.2.6
    com.apple.iokit.IOAcceleratorFamily2 98.20
    com.apple.driver.AppleHDAController 2.6.1f2
    com.apple.iokit.IOHDAFamily 2.6.1f2
    com.apple.nvidia.driver.NVDAResman 8.2.6
    com.apple.AppleGraphicsDeviceControl 3.5.26
    com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.4f1
    com.apple.driver.AppleBacklightExpert 1.0.4
    com.apple.iokit.IONDRVSupport 2.4.1
    com.apple.driver.AppleSMBusController 1.0.11d1
    com.apple.driver.AppleSMC 3.1.8
    com.apple.iokit.IOGraphicsFamily 2.4.1
    com.apple.driver.AppleThunderboltEDMSink 2.1.3
    com.apple.iokit.IOSCSIBlockCommandsDevice 3.6.6
    com.apple.driver.AppleUSBHIDKeyboard 170.15
    com.apple.driver.AppleHIDKeyboard 170.15
    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.IOUSBHIDDriver 660.4.0
    com.apple.iokit.IOUSBMassStorageClass 3.6.0
    com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.6
    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.driver.CoreStorage 380
    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.IOEthernetAVBController 1.0.3b4
    com.apple.driver.mDNSOffloadUserClient 1.0.1b5
    com.apple.iokit.IO80211Family 630.35
    com.apple.iokit.IONetworkingFamily 3.2
    com.apple.iokit.IOUSBUserClient 660.4.2
    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
    Model: iMac13,2, BootROM IM131.010A.B05, 4 processors, Intel Core i7, 3.4 GHz, 32 GB, SMC 2.11f14
    Graphics: NVIDIA GeForce GTX 680MX, NVIDIA GeForce GTX 680MX, PCIe, 2048 MB
    Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D5434314753364D465238432D50422020
    Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D5434314753364D465238432D50422020
    Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D5434314753364D465238432D50422020
    Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D5434314753364D465238432D50422020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xF4), Broadcom BCM43xx 1.0 (5.106.98.100.22)
    Bluetooth: Version 4.2.4f1 13674, 3 services, 23 devices, 1 incoming serial ports
    Network Service: Ethernet, Ethernet, en0
    Serial ATA Device: APPLE HDD ST3000DM001, 3 TB
    Serial ATA Device: APPLE SSD SM128E, 121.33 GB
    USB Device: USB 3.0 HUB
    USB Device: Hub
    USB Device: Apple USB SuperDrive
    USB Device: FaceTime HD Camera (Built-in)
    USB Device: USB 2.0 HUB
    USB Device: Wacom Wireless Receiver
    USB Device: My Book 111A
    USB Device: Hub
    USB Device: Keyboard Hub
    USB Device: Apple Keyboard
    USB Device: Hub
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    Thunderbolt Bus: iMac, Apple Inc., 23.4

    That panic was not caused by third-party software. If the problem is recurrent, the possibilities are:
    A stale or corrupt kernel cache
    A damaged OS X installation
    A fault in a peripheral device, if any
    Corrupt non-volatile memory (NVRAM)
    An internal hardware fault (including incompatible memory)
    An obscure bug in OS X
    You may already have ruled out some of these.
    Rule out #1 by starting up in safe mode and then restarting as usual. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
    You can rule out #2 and #3 by reinstalling the OS and testing with non-essential peripherals disconnected and aftermarket expansion cards removed, if applicable. Sometimes a clean reinstallation may solve a problem that isn't solved by reinstalling in place.
    Corrupt NVRAM, which rarely causes panics, can be ruled out by resetting it.
    If your model has user-replaceable memory, and you've upgraded the memory modules, reinstall the original memory and see whether there's any improvement. Be careful not to touch the gold contacts. Clean them with a mild solvent such as rubbing alcohol. Aftermarket memory must exactly match the technical specifications of the machine.
    Apple Diagnostics or the Apple Hardware Test, though generally unreliable, will sometimes detect a fault. A negative test can't be depended on. Run the extended version of the test, if applicable.
    In the category of obscure bugs, reports suggest that FileVault may trigger kernel traps under some unknown conditions. Most, though not all, of these reports seem to involve starting up from an aftermarket SSD. If those conditions apply to you, try deactivating FileVault.
    Even if FileVault is not active, an aftermarket SSD may be the cause of kernel panics. Check the manufacturer's website for a firmware update.
    Connecting more than one display is another reported trigger for OS X bugs.
    If the system is not fully up to date, running Software Update might get you a bug fix.
    In rare cases, a malformed network packet from a defective router or other network device can cause panics. Such packets could also be sent deliberately by a skillful attacker. This possibility is something to consider if you run a public server that might be the target of such an attack.
    Otherwise, make a "Genius" appointment at an Apple Store, or go to another authorized service provider to have the machine tested. You may have to leave it there for several days. There isn't much point in doing this unless you can reproduce the panic, or if you can't, it happens often enough that it's likely to be repeated at the store. Otherwise you may be told that nothing is wrong.
    Print the first page of the panic report and bring it with you.

  • Why does my iMac keep waking up (I've checked the usual suspects)?

    Starting a couple of weeks after I got my new iMac (3.4 GHz Core i7) -- so about two or three weeks ago -- it started spontaneously waking from sleep (or turning on its screen, if it wasn't asleep), every few minutes. I can't figure out why.
    I've checked to see if there are spurious input sources, and as far as I can tell, there aren't.
    Wake on Network Access is turned off (even though I actually would prefer it to be on, I've turned it off while trying to sort this out.
    I don't have, as far as I can tell, any new apps or tools installed that would be waking it up.
    If I quit all my applications, it doesn't seem to affect anything.
    The wake reason string when I search logs is "EHC1". That doesn't tell me much.
    Any ideas on what else I can check?

    Test after each of the following steps that you haven’t already tried:
    Step 1
     ▹ System Preferences ▹ Print & Scan ▹ Open Print Queue...
    Check all printers for unfinished jobs. Deal with any you find.
    Step 2
     ▹ System Preferences ▹ Energy Saver ▹ Power Adapter ▹ Wake for network access: uncheck. You may need to unlock the preference pane by clicking the lock icon in the lower left corner and entering your administrator password.
    Step 3
     ▹ System Preferences ▹ Energy Saver ▹ Schedule… ▹ Start up or wake: uncheck
    Step 4
    Disconnect all wired peripherals except keyboard, mouse or trackball, and monitor, if applicable.
    Step 5
    Launch the Activity Monitor application in any 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. Click Utilities, then Activity Monitor in the page that opens.
    Select All Processes from the menu in the toolbar of the Activity Monitor window, if not already selected. Enter “powerd” (without the quotes) in the "Filter" text field. Select the powerd process and click the Quit Process button in the toobar (stop-sign icon.) In the sheet that opens, click Force Quit. You’ll be prompted for your administrator password. The process will be relaunched immediately.
    Step 6
    Boot in safe mode and log in. The instructions provided by Apple are as follows:
    Be sure your Mac is shut down.
    Press the power button.
    Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
    Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, you can’t boot in safe mode.
    Safe mode is much slower to boot and run than normal. Don’t launch any applications at first. If sleep still doesn’t work properly, back up all data and reinstall the OS. After that, if you still have the issue, make a “Genius” appointment at an Apple Store to have the machine tested.
    If sleep now works as expected, go on to the next step.
    Step 7
    Still in safe mode, launch the usual set of applications that are running when you have the problem, including your login items, one at a time, testing after each one. Some applications may not work; skip them. You might be able to identify the cause of the problem this way.
    Step 8
    If sleep is still working after you’ve launched all the usual applications, reboot as usual (not in safe mode) and test again. If sleep still works, you’re done, at least for the moment.
    If you still have the sleep issue after booting out of safe mode, post again.

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