IMac crashes when external drives plugged in

Hi there
In the last few days my iMac has developed a bizarre problem whenever I plug in an external hard drive or memory stick. First of all the desktop fails to recognise the new device, then I get the black veil descending over the screen and a message that "OSX has encountered a problem and needs to close". It happens whether I plug the external drive into a USB or firewire socket.
Disk Utility shows no problems, nor does TechToolPro. Have also scanned using Clam and Intego Virus Barrier and all is clear. Has anyone ever had this problem? Another Mac-using friend said it sounded like a mother board problem.
The other strange thing is that I can boot up from the same external drive fine (it has a copy of the system disk installed)
Any suggestions gratefully received!
Thanks
John

Do you have any other firewire or USB peripherals that you use without problems?
Try the suggestions below to see if they help:
1. Downloading and installing the combo updater of the system software update they've just applied via "Software Update...".
2. Another trick is to restart each by zapping the parameter RAM:
Zapping the P-RAM:
After the startup tone, hold down <commandd><option><r> until 3 additional startup tones are heard, then release the 4 keys.
3. A 3rd tip would be to do Open Firmware resets on each:
After the startup tone, hold down <command><option><o><f> until the text screen is visible. When text can be entered, type the following commands, followed by the <return> key (there are no space characters in each command):
reset-nvram
set-defaults
reset-all (the Mac will boot up after this command is entered)
If none does, you may need to replace your logic board.

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    com.apple.iokit.IOAcceleratorFamily2(156.14)[BE7D765B-49C1-34F9-B75E-3EAF8A4062A 3]@0xffffff7f9d593000->0xffffff7f9d601fff
    dependency: com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f9bc47000
    dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[82EAD591-67E3-39CB-A232-A8095CA30E92]@0 xffffff7f9c1a7000
    BSD process name corresponding to current thread: Preview
    Mac OS version:
    14D131
    Kernel version:
    Darwin Kernel Version 14.3.0: Mon Mar 23 11:59:05 PDT 2015; root:xnu-2782.20.48~5/RELEASE_X86_64
    Kernel UUID: 4B3A11F4-77AA-3D27-A22D-81A1BC5B504D
    Kernel slide: 0x000000001b200000
    Kernel text base: 0xffffff801b400000
    __HIB  text base: 0xffffff801b300000
    System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61)
    System uptime in nanoseconds: 634836714373
    last loaded kext at 182849432838: com.apple.filesystems.smbfs      3.0.1 (addr 0xffffff7f9c104000, size 393216)
    last unloaded kext at 522424676062: com.apple.filesystems.msdosfs          1.10 (addr 0xffffff7f9c647000, size 61440)
    loaded kexts:
    com.eset.kext.esets_kac          600.01.40f01
    com.paragon-software.filesystems.ntfs          82
    com.eset.kext.esets_pfw         600.01.40f01
    com.logmein.driver.LogMeInSoundDriver     4.1.48f99
    org.virtualbox.kext.VBoxUSB 4.1.8
    org.virtualbox.kext.VBoxDrv  4.1.8
    com.apple.filesystems.smbfs 3.0.1
    com.apple.filesystems.udf      2.5
    com.apple.driver.AppleHWSensor    1.9.5d0
    com.apple.driver.AGPM        110.19.5
    com.apple.driver.ApplePlatformEnabler        2.2.0d4
    com.apple.driver.X86PlatformShim   1.0.0
    com.apple.filesystems.autofs 3.0
    com.apple.driver.AppleBluetoothMultitouch           85.3
    com.apple.iokit.IOBluetoothSerialManager   4.3.4f4
    com.apple.driver.AppleOSXWatchdog          1
    com.apple.driver.AppleMikeyHIDDriver     124
    com.apple.driver.AppleHDA 272.18
    com.apple.driver.AppleUpstreamUserClient            3.6.1
    com.apple.iokit.IOUserEthernet        1.0.1
    com.apple.driver.AppleMikeyDriver            272.18
    com.apple.Dont_Steal_Mac_OS_X   7.0.0
    com.apple.driver.AppleHWAccess    1
    com.apple.driver.AppleHV    1
    com.apple.driver.AppleIntelHD5000Graphics          10.0.6
    com.apple.driver.AppleThunderboltIP          2.0.2
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.4f4
    com.apple.GeForce     10.0.2
    com.apple.driver.AppleSMCLMU    2.0.7d0
    com.apple.driver.AppleLPC  1.7.3
    com.apple.driver.AudioAUUC          1.70
    com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
    com.apple.driver.AppleIntelFramebufferAzul           10.0.6
    com.apple.driver.AppleBacklight       170.7.4
    com.apple.driver.AppleMCCSControl          1.2.11
    com.apple.iokit.IOUSBAttachedSCSI           1.1.1
    com.apple.iokit.SCSITaskUserClient 3.7.5
    com.apple.driver.AppleUSBODD     3.5.5
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless       1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib  1.0.0d1
    com.apple.BootCache 36
    com.apple.driver.AppleUSBHub       705.4.2
    com.apple.driver.XsanFilter   404
    com.apple.iokit.IOAHCIBlockStorage           2.7.1
    com.apple.iokit.AppleBCM5701Ethernet     10.1.3
    com.apple.driver.AppleSDXC           1.6.5
    com.apple.driver.AirPort.Brcm4360  930.37.3
    com.apple.driver.AppleUSBXHCI    710.4.11
    com.apple.driver.AppleAHCIPort     3.1.2
    com.apple.driver.AppleRTC  2.0
    com.apple.driver.AppleACPIButtons           3.1
    com.apple.driver.AppleHPET           1.8
    com.apple.driver.AppleSMBIOS       2.1
    com.apple.driver.AppleACPIEC       3.1
    com.apple.driver.AppleAPIC            1.7
    com.apple.nke.applicationfirewall      161
    com.apple.security.quarantine            3
    com.apple.security.TMSafetyNet     8
    com.apple.kext.triggers           1.0
    com.apple.driver.IOBluetoothHIDDriver      4.3.4f4
    com.apple.driver.AppleMultitouchDriver     263.9.1
    com.apple.iokit.IOSerialFamily          11
    com.apple.driver.DspFuncLib            272.18
    com.apple.kext.OSvKernDSPLib       1.15
    com.apple.iokit.IOSurface      97.4
    com.apple.driver.AppleThunderboltEDMSink         4.0.2
    com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.4f4
    com.apple.iokit.IOBluetoothFamily  4.3.4f4
    com.apple.nvidia.driver.NVDAGK100Hal    10.0.2
    com.apple.nvidia.driver.NVDAResman         10.0.2
    com.apple.driver.AppleHDAController        272.18
    com.apple.iokit.IOHDAFamily         272.18
    com.apple.driver.AppleSMBusPCI   1.0.12d1
    com.apple.iokit.IOSlowAdaptiveClockingFamily     1.0.0
    com.apple.AppleGraphicsDeviceControl      3.10.22
    com.apple.iokit.IOAcceleratorFamily2          156.14
    com.apple.driver.X86PlatformPlugin 1.0.0
    com.apple.driver.IOPlatformPluginFamily    5.9.1d7
    com.apple.driver.AppleBacklightExpert        1.1.0
    com.apple.driver.AppleSMC 3.1.9
    com.apple.driver.AppleSMBusController     1.0.13d1
    com.apple.iokit.IOUSBUserClient     705.4.0
    com.apple.iokit.IONDRVSupport     2.4.1
    com.apple.iokit.IOGraphicsFamily    2.4.1
    com.apple.driver.AppleUSBAudio    295.23
    com.apple.iokit.IOAudioFamily        203.3
    com.apple.vecLib.kext            1.2.0
    com.apple.iokit.IOSCSIBlockCommandsDevice       3.7.5
    com.apple.driver.AppleUSBHIDKeyboard   176.2
    com.apple.driver.AppleHIDKeyboard          176.2
    com.apple.iokit.IOUSBHIDDriver    705.4.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.7.5
    com.apple.iokit.IOBDStorageFamily 1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily 1.7.1
    com.apple.iokit.IOUSBMassStorageClass     3.7.2
    com.apple.iokit.IOSCSIArchitectureModelFamily    3.7.5
    com.apple.driver.AppleUSBMergeNub         705.4.0
    com.apple.driver.AppleUSBComposite        705.4.9
    com.apple.driver.AppleThunderboltDPInAdapter    4.0.6
    com.apple.driver.AppleThunderboltDPOutAdapter 4.0.6
    com.apple.driver.AppleThunderboltDPAdapterFamily        4.0.6
    com.apple.driver.AppleThunderboltPCIDownAdapter        2.0.2
    com.apple.driver.AppleThunderboltNHI      3.1.7
    com.apple.iokit.IOThunderboltFamily          4.2.2
    com.apple.iokit.IOEthernetAVBController   1.0.3b3
    com.apple.iokit.IO80211Family        730.60
    com.apple.driver.mDNSOffloadUserClient   1.0.1b8
    com.apple.iokit.IONetworkingFamily           3.2
    com.apple.iokit.IOUSBFamily           720.4.4
    com.apple.iokit.IOAHCIFamily        2.7.5
    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 396
    com.apple.iokit.IOStorageFamily       2.0
    com.apple.iokit.IOReportFamily       31
    com.apple.driver.AppleFDEKeyStore           28.30
    com.apple.driver.AppleACPIPlatform          3.1
    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
    Model: iMac14,2, BootROM IM142.0118.B09, 4 processors, Intel Core i5, 3.4 GHz, 24 GB, SMC 2.15f7
    Graphics: NVIDIA GeForce GTX 775M, NVIDIA GeForce GTX 775M, PCIe, 2048 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3430554738454655352D474E4C2D46
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3430554738454655352D474E4C2D46
    Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1600 MHz, 0x859B, 0x43543130323436344246313630422E433136
    Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1600 MHz, 0x859B, 0x43543130323436344246313630422E433136
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x111), Broadcom BCM43xx 1.0 (7.15.166.24.3)
    Bluetooth: Version 4.3.4f4 15601, 3 services, 27 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en1
    Serial ATA Device: APPLE HDD WD10EZES-40UFAA0, 1 TB
    USB Device: USB3.0 Hub
    USB Device: USB3.0 Hub
    USB Device: USB3.0 Hub
    USB Device: BUP Slim SL
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: FaceTime HD Camera (Built-in)
    USB Device: Keyboard Hub
    USB Device: Apple Keyboard
    USB Device: USB2.0 Hub
    USB Device: USB2.0 Hub
    USB Device: USB2.0 Hub
    USB Device: iPad
    USB Device: USB 2.0 Hub [MTT]
    USB Device: Yeti Stereo Microphone
    USB Device: FreeAgent GoFlex
    USB Device: Apple USB SuperDrive
    Thunderbolt Bus: iMac, Apple Inc., 23.10

    Most likely culprit is one of these:
    com.eset.kext.esets_kac          600.01.40f01
    com.paragon-software.filesystems.ntfs          82 c
    om.eset.kext.esets_pfw        600.01.40f01
    com.logmein.driver.LogMeInSoundDriver    4.1.48f99
    org.virtualbox.kext.VBoxUSB 4.1.8
    org.virtualbox.kext.VBoxDrv  4.1.8
    Boot into safe mode (restart holding down SHIFT key). If no KP, then uninstall those items and reboot. If KP, then most likely hardware related.  Run the Apple Hardware Test suite, extended tests at least twice, followed by Rember.  See
    OS X About kernel panics,
    Computer spontaneously restarts,
    Technical Note TN2063: Understanding and Debugging Kernel Panics,
    Mac OS X Kernel Panic FAQ,
    Resolving Kernel Panics,
    How to troubleshoot a kernel panic, and
    Tutorial: Avoiding and eliminating Kernel panics for more details.
    27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.3), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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