IMac crashes. switches off with a loud 1sec buzz every 15secs.

iMac crashing with screen going black and a regular 1 second beep obout every 15 seconds. It can only be restarted by switching off the mains supply. The fault occurs at any stage of computer operation i.e. typing, reading files, manipulating graphics, and even when in screen saver mode. Anybody help?

I believe it's a RAM problem.  Try taking out the RAM and then putting it back in.  Maybe they came loose.  If that doesn't work, if you have 2 RAM sticks, try taking 1 out and restarting.  If the beeping/crash goes away, the other stick of RAM is bad.  If it does crash, try the other RAM stick.  You could try new RAM (which is pretty cheap these days).  If all else fails, it's probably an issue with the logic board and it will need repairing.
Good luck!

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    Anonymous UUID:       28AB9217-9620-728F-FA94-64852532342A
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    13B42
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    Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
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    Kernel text base: 0xffffff802c200000
    System model name: iMac12,1 (Mac-942B5BF58194151B)
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    com.apple.driver.AppleBluetoothMultitouch          80.14
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AGPM          100.14.11
    com.apple.filesystems.autofs          3.0
    com.apple.iokit.IOBluetoothSerialManager          4.2.0f6
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.driver.AppleHDA          2.5.3fc1
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    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleMikeyDriver          2.5.3fc1
    com.apple.driver.AppleHWAccess          1
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleThunderboltIP          1.0.10
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.AppleMCCSControl          1.1.12
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    com.apple.AMDRadeonX3000          1.1.4
    com.apple.kext.AMD6000Controller          1.1.4
    com.apple.driver.AppleIntelHD3000Graphics          8.1.8
    com.apple.driver.AppleSMCLMU          2.0.4d1
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    com.apple.driver.AppleIntelSNBGraphicsFB          8.1.8
    com.apple.iokit.SCSITaskUserClient          3.6.0
    com.apple.driver.AppleUSBCardReader          3.3.5
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    com.apple.iokit.IONDRVSupport          2.3.6
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    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
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    com.apple.driver.AppleEFIRuntime          2.0
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    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.iokit.IOReportFamily          21
    com.apple.driver.AppleFDEKeyStore          28.30
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    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.pthread          1
    com.apple.kec.corecrypto          1.0
    I'd be grateful if one of you gurus shed some light on the possible cause.
    Cheers and happy new year!

    That panic was not caused by third-party software, and it's the kind that is usually caused by a memory fault. 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.

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    com.apple.driver.AppleBluetoothMultitouch          75.19
    com.apple.iokit.IOBluetoothSerialManager          4.1.7f2
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.X86PlatformShim          1.0.0
    com.apple.driver.ApplePlatformEnabler          2.0.7d2
    com.apple.driver.AGPM          100.13.12
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.driver.AppleHDAHardwareConfigDriver          2.4.7fc4
    com.apple.driver.AppleHDA          2.4.7fc4
    com.apple.driver.AppleUpstreamUserClient          3.5.12
    com.apple.iokit.IOBluetoothUSBDFU          4.1.7f2
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.1.7f4
    com.apple.GeForce          8.1.6
    com.apple.driver.AppleMuxControl          3.4.5
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.driver.AppleMikeyDriver          2.4.7fc4
    com.apple.driver.AppleIntelHD4000Graphics          8.1.6
    com.apple.driver.AppleSMCLMU          2.0.3d0
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.ApplePolicyControl          3.4.5
    com.apple.driver.AppleLPC          1.6.3
    com.apple.driver.AppleSMBusPCI          1.0.11d1
    com.apple.driver.AppleIntelFramebufferCapri          8.1.6
    com.apple.nvidia.NVDAStartup          8.1.6
    com.apple.iokit.SCSITaskUserClient          3.5.6
    com.apple.driver.AppleUSBODD          3.3.1
    com.apple.driver.AppleFileSystemDriver          3.0.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          34
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.3.5
    com.apple.driver.AppleUSBHub          635.4.0
    com.apple.driver.AppleSDXC          1.4.3
    com.apple.iokit.AppleBCM5701Ethernet          3.6.2b4
    com.apple.driver.AppleAHCIPort          2.6.6
    com.apple.driver.AirPort.Brcm4331          615.20.17
    com.apple.driver.AppleUSBEHCI          621.4.6
    com.apple.driver.AppleUSBXHCI          635.4.0
    com.apple.driver.AppleACPIButtons          1.8
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.8
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          214.0.0
    com.apple.nke.applicationfirewall          4.0.39
    com.apple.security.quarantine          2.1
    com.apple.driver.AppleIntelCPUPowerManagement          214.0.0
    com.apple.driver.IOBluetoothHIDDriver          4.1.7f2
    com.apple.driver.AppleMultitouchDriver          237.4
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.4.7fc4
    com.apple.iokit.IOAudioFamily          1.9.2fc7
    com.apple.kext.OSvKernDSPLib          1.12
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    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.nvidia.gk100hal          8.1.6
    com.apple.NVDAResman          8.1.6
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    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.iokit.IOSurface          86.0.4
    com.apple.iokit.IOBluetoothFamily          4.1.7f2
    com.apple.driver.AppleSMC          3.1.5d4
    com.apple.driver.AppleGraphicsControl          3.4.5
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    com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
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    com.apple.driver.AppleUSBMergeNub          621.4.6
    com.apple.driver.AppleUSBComposite          621.4.0
    com.apple.driver.AppleThunderboltNHI          1.9.2
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    com.apple.iokit.IOUSBUserClient          630.4.4
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    com.apple.driver.AppleEFINVRAM          2.0
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    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
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    USB Device: hub_device, 0x058f  (Alcor Micro, Corp.), 0x6254, 0x1a124000 / 6
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    USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8511, 0x1a110000 / 3
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1d100000 / 2
    USB Device: MacBook Air SuperDrive, apple_vendor_id, 0x1500, 0x1d130000 / 5
    USB Device: hub_device, 0x0424  (SMSC), 0x2412, 0x1d180000 / 3
    USB Device: BRCM20702 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1d181000 / 4
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    Thanks for your help Andrew.
    Have tried that and seems to be working at the mo (touch wood). See how it goes.
    Can't tell you what a difference it is compared to the monitors speakers.
    Thanks Again
    Peter

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