Apple IMac - 3 Beeps, pause, 3 beeps, memory issues

Question

Hello,A few issues have arises with my apple Imac.The first thing I noticed was the fan was going absolutley full blast all the time. It made watching movies unwatchable due to the noise.The second I noticed was sluggish memory.The Imac was also getting overheated very quickly.Then about a month ago, the computer had a kernel. I switched it on and I got: 3 Beeps, pause, 3 beeps. This last about 30 mins and I gave up and switched it off.I then switched it on again and got past the three beeps and got a Kernel panic on startup (white text highlighted in black).After the computer had fully cooled down, I switched it on again and managed to get it to work. I backed everything up, despite the computer suffering numerous kernels.My iMac was still under warranty with Dixons who sent KnowHow to pick it up and fix it.They said they&#x27;d fixed all the problems. I still had problems with the computer overheating and the memory seemed to be sluggish (though be it not as bad as before) but it was peforming a lot better.Today, I had another kernel panic and recieved the 3 Beeps, pause, 3 beeps, pause etc message on startup. Again, I left it to cool down and it&#x27;s now running reasonably quick. My iMac&#x27;s warranty lapsed a few days ago (I am going to press that KnowHow haven&#x27;t fixed an outstanding problem and try and get them to look at it)Any ideas to what the problem could be?Many thanks,

babowa · Answer

What model iMac, processor, year, and how much RAM is installed?The beeps usually indicate a RAM issue (and RAM can go bad)  - that you can easily fix yourself; simply buy modules from a trusted RAM vendor (OWC &#x3D; macsales.com in US and/or Crucial elsewhere) - it is easy to install and it is also rather inexpensive these days.Unfortunately, I do not know if the overheating could have anything to do with the RAM - hopefully someone will chime in with that. Who are these &#x27;knowhow&#x27; people - are they Apple authorized service providers? Of course, if they&#x27;ve had the thing and claimed it was fixed, take it back. Personally, I would not trust anyone but an Apple authorized provider and I would certainly see if an install of good RAM might fix the issue.

SpringHeeledJim · Answer

The iMac is the  Apple iMac MC812.Apple 2.7ghz Intel Core i5 RAM: 12gb (2 x 2gb of the RAM that came with the computer, 2 x 4gb of Cruicial RAM).KnowHow are Dixons repair service (Dixons is the UK&#x27;s 2nd biggest computer chain) - I don&#x27;t believe they&#x27;re affiliated with Apple.I have just sorted out a replacement for my 2 pieces of Crucial RAM.

babowa · Answer

So does the computer work without the Crucial RAM in it? Or maybe it&#x27;s the original RAM that is defective and the Crucial works?So if Dixon&#x27;s is not a Mac store, then you can&#x27;t expect 100% satisfactory Mac service - they may want to please, but may not have a Mac knowledgeable tach.

SpringHeeledJim · Answer

The computer is working fine without the Crucial RAM but it was working fine with it (a little sluggish) this morning before it went into meltdown this evening.For some reason, I&#x27;ve come to associate the issue related to it becoming overheated. The computer can get overheated very quickly. If the computer It&#x27;s unfortunatley not under Apple warranty but if replacing the Crucial memory doesn&#x27;t improve things when my wage comes through I&#x27;ll take it to the nearest Mac store and get them to look into it.I do a lot of 3D rendering and there&#x27;s been occasions where the render will take 5+ hours, I&#x27;ll switch the computer off and on and try the same render on the same settings and the render will take 20 minutes.

babowa · Answer

Ahh, rendering...... That is the single most heavy duty task for it. An i7 and higher processor would be better and the max RAM it can take...According to these specs,http://www.everymac.com/systems/apple/imac/specs/imac-core-i5-2.7-21-inch-alumin um-mid-2011-thunderbolt-specs.htmlyours can take 16 GB officially, but has been tested with 32. So, I&#x27;d go at least to 16 GB.I&#x27;d also, if possible, give it a rest in between and don&#x27;t use it for anything but the rendering while that is going on. Also, make sure you have plenty of hard drive space free/available.If you do decide to take it to an Apple store, make an appointment at the Genius Bar; the advice/diagnosis is free. You&#x27;d probably have to pay for a repair.

SpringHeeledJim · Answer

Hi,I finally thought things were OK. I replaced my RAM a couple of weeks a go and since then there were no problems until last night when I had two kernels in the space of ten mins whilst watching a DVD (which was very frustrating as it was near the end!).I have today received another kernel,Here is the report:Interval Since Last Panic Report:  747738 secPanics Since Last Report:          3Anonymous UUID:                    B0DC80EF-4374-4DA7-8594-5199AE64CC19Wed Aug 21 23:11:00 2013panic(cpu 1 caller 0xffffff80002c4794): Kernel trap at 0xffffff7f80ff4d8a, type 14&#x3D;page fault, registers:CR0: 0x000000008001003b, CR2: 0x0000000000048072, CR3: 0x0000000000100000, CR4: 0x00000000000606e0RAX: 0x0000000000048072, RBX: 0x00000000f4041473, RCX: 0xffffff7f8103a711, RDX: 0xffffff7f8103a81eRSP: 0xffffff8160d13e40, RBP: 0xffffff8160d13e80, RSI: 0x0000000000000400, RDI: 0xffffff8139731004R8:  0x0000000000000000, R9:  0x00000000f4041473, R10: 0x0000000000000046, R11: 0x0000000000000011R12: 0xffffff7f80f60708, R13: 0xffffff8019c88200, R14: 0xffffff8139731004, R15: 0x0000000081041175RFL: 0x0000000000010202, RIP: 0xffffff7f80ff4d8a, CS:  0x0000000000000008, SS:  0x0000000000000010CR2: 0x0000000000048072, Error code: 0x0000000000000002, Faulting CPU: 0x1Backtrace (CPU 1), Frame : Return Address0xffffff8160d13af0 : 0xffffff8000220792 0xffffff8160d13b70 : 0xffffff80002c4794 0xffffff8160d13d20 : 0xffffff80002da55d 0xffffff8160d13d40 : 0xffffff7f80ff4d8a 0xffffff8160d13e80 : 0xffffff7f80fa16c5 0xffffff8160d13ec0 : 0xffffff7f80f607c0 0xffffff8160d13ef0 : 0xffffff800063d4d6 0xffffff8160d13f30 : 0xffffff800063c250 0xffffff8160d13f70 : 0xffffff800063c0f4 0xffffff8160d13fb0 : 0xffffff8000820057       Kernel Extensions in backtrace:         com.apple.driver.AirPort.Atheros40(505.67.1)[22D398BB-ADD4-3DED-88A6-6774984FA4 36]@0xffffff7f80f41000-&gt;0xffffff7f81085fff            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f80867000            dependency: com.apple.iokit.IO80211Family(420.3)[7114D6D6-7068-3091-8CB9-4424042DB307]@0xff ffff7f80f0e000            dependency: com.apple.iokit.IONetworkingFamily(2.1)[2FCC16E1-34AB-3908-98BD-CCBFA56FFDCE]@0 xffffff7f8099e000BSD process name corresponding to current thread: kernel_taskMac OS version:11G63bKernel version:Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5System model name: iMac12,1 (Mac-942B5BF58194151B)System uptime in nanoseconds: 18857984075685last loaded kext at 35408928992: com.sophos.kext.sav          8.0.14 (addr 0xffffff7f80af2000, size 24576)loaded kexts:com.sophos.kext.sav          8.0.14com.Cycling74.driver.Soundflower          1.5.2at.obdev.nke.LittleSnitch          2.5.3com.apple.driver.AppleHWSensor          1.9.5d0com.apple.driver.AppleMikeyHIDDriver          122com.apple.driver.AudioAUUC          1.59com.apple.driver.AppleHDAHardwareConfigDriver          2.2.5a5com.apple.driver.AppleUpstreamUserClient          3.5.9com.apple.driver.AppleHDA          2.2.5a5com.apple.driver.AppleMikeyDriver          2.2.5a5com.apple.driver.AppleTyMCEDriver          1.0.2d2com.apple.driver.AGPM          100.12.75com.apple.kext.ATIFramebuffer          7.3.2com.apple.filesystems.autofs          3.0com.apple.iokit.IOUserEthernet          1.0.0d1com.apple.iokit.IOBluetoothSerialManager          4.0.8f17com.apple.Dont_Steal_Mac_OS_X          7.0.0com.apple.driver.AppleSMCPDRC          5.0.0d8com.apple.driver.AppleSMCLMU          2.0.1d2com.apple.driver.AudioIPCDriver          1.2.3com.apple.driver.ApplePolicyControl          3.1.33com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8com.apple.driver.AppleMuxControl          3.1.33com.apple.driver.AppleLPC          1.6.0com.apple.ATIRadeonX3000          7.3.2com.apple.driver.AppleBacklight          170.2.2com.apple.driver.AppleMCCSControl          1.0.33com.apple.driver.AppleIntelHD3000Graphics          7.3.2com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17com.apple.iokit.SCSITaskUserClient          3.2.1com.apple.driver.AppleUSBCardReader          3.0.6com.apple.iokit.IOAHCISerialATAPI          2.0.3com.apple.driver.AppleIRController          312com.apple.driver.XsanFilter          404com.apple.iokit.IOAHCIBlockStorage          2.1.0com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1com.apple.BootCache          33com.apple.driver.AppleUSBHub          5.1.0com.apple.driver.AirPort.Atheros40          505.67.1com.apple.iokit.AppleBCM5701Ethernet          3.2.4b8com.apple.driver.AppleEFINVRAM          1.6.1com.apple.driver.AppleFWOHCI          4.9.0com.apple.driver.AppleAHCIPort          2.3.1com.apple.driver.AppleUSBEHCI          5.1.0com.apple.driver.AppleUSBUHCI          5.1.0com.apple.driver.AppleACPIButtons          1.5com.apple.driver.AppleRTC          1.5com.apple.driver.AppleHPET          1.7com.apple.driver.AppleSMBIOS          1.9com.apple.driver.AppleACPIEC          1.5com.apple.driver.AppleAPIC          1.6com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0com.apple.nke.applicationfirewall          3.2.30com.apple.security.quarantine          1.4com.apple.security.TMSafetyNet          8com.apple.driver.AppleIntelCPUPowerManagement          195.0.0com.apple.driver.AppleBluetoothHIDKeyboard          160.7com.apple.driver.AppleHIDKeyboard          160.7com.apple.driver.IOBluetoothHIDDriver          4.0.8f17com.apple.driver.DspFuncLib          2.2.5a5com.apple.kext.triggers          1.0com.apple.iokit.IOSurface          80.0.2com.apple.iokit.IOSerialFamily          10.0.5com.apple.iokit.IOFireWireIP          2.2.5com.apple.iokit.IOAudioFamily          1.8.6fc18com.apple.kext.OSvKernDSPLib          1.3com.apple.driver.AppleHDAController          2.2.5a5com.apple.iokit.IOHDAFamily          2.2.5a5com.apple.driver.AppleSMC          3.1.3d10com.apple.driver.IOPlatformPluginLegacy          5.0.0d8com.apple.driver.AppleSMBusPCI          1.0.10d0com.apple.driver.AppleGraphicsControl          3.1.33com.apple.driver.IOPlatformPluginFamily          5.1.1d6com.apple.driver.AppleBacklightExpert          1.0.4com.apple.driver.AppleThunderboltEDMSink          1.1.8com.apple.driver.AppleThunderboltEDMSource          1.1.8com.apple.driver.AppleSMBusController          1.0.10d0com.apple.kext.ATI6000Controller          7.3.2com.apple.kext.ATISupport          7.3.2com.apple.iokit.IONDRVSupport          2.3.4com.apple.driver.AppleIntelSNBGraphicsFB          7.3.2com.apple.iokit.IOGraphicsFamily          2.3.4com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17com.apple.iokit.IOBluetoothFamily          4.0.8f17com.apple.driver.AppleThunderboltDPOutAdapter          1.8.5com.apple.driver.AppleThunderboltDPInAdapter          1.8.5com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.5com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.5com.apple.driver.AppleFileSystemDriver          13com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1com.apple.iokit.IOBDStorageFamily          1.7com.apple.iokit.IODVDStorageFamily          1.7.1com.apple.iokit.IOCDStorageFamily          1.7.1com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1com.apple.iokit.IOUSBMassStorageClass          3.0.3com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1com.apple.iokit.IOUSBHIDDriver          5.0.0com.apple.driver.AppleUSBMergeNub          5.1.0com.apple.driver.AppleUSBComposite          5.0.0com.apple.driver.AppleThunderboltNHI          1.6.0com.apple.iokit.IOThunderboltFamily          2.0.3com.apple.iokit.IOUSBUserClient          5.0.0com.apple.iokit.IO80211Family          420.3com.apple.iokit.IOEthernetAVBController          1.0.1b1com.apple.iokit.IONetworkingFamily          2.1com.apple.iokit.IOFireWireFamily          4.4.8com.apple.iokit.IOAHCIFamily          2.0.8com.apple.iokit.IOUSBFamily          5.1.0com.apple.driver.AppleEFIRuntime          1.6.1com.apple.iokit.IOHIDFamily          1.7.1com.apple.iokit.IOSMBusFamily          1.1com.apple.security.sandbox          177.8com.apple.kext.AppleMatch          1.0.0d1com.apple.driver.DiskImages          331.7com.apple.iokit.IOStorageFamily          1.7.2com.apple.driver.AppleKeyStore          28.18com.apple.driver.AppleACPIPlatform          1.5com.apple.iokit.IOPCIFamily          2.7com.apple.iokit.IOACPIFamily          1.4Model: iMac12,1, BootROM IM121.0047.B1F, 4 processors, Intel Core i5, 2.7 GHz, 12 GB, SMC 1.71f22Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe, 512 MBMemory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435434473353313333394D2E4D3136464D44Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435434473353313333394D2E4D3136464D44Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.67.5-P2PBluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial portsNetwork Service: Wi-Fi, AirPort, en1Serial ATA Device: ST31000528AS, 1 TBSerial ATA Device: HL-DT-STDVDRW  GA32NUSB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x850b, 0xfa200000 / 3USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2USB Device: External HDD, 0x1bcf  (Sunplus Innovation Technology Inc.), 0x0c31, 0xfa120000 / 6USB Device: USB OPTICAL MOUSE, 0x15d9, 0x0a4d, 0xfa130000 / 5USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 7USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfd110000 / 3Does it give any clues?Thanks for all your help.

TildeBee · Answer

Those 3 beeps indicate a serious problem with your one or more of your RAM chips.You need to look carefully into , and test your different banks.Also, have you tried turning off Sophos , just to test?

Klaus1 · Answer

Also, have you tried turning off Sophos , just to test?Also Little Snitch?

TildeBee · Answer

Yup, but after he&#x27;s tested Sophos, IMHO.

SeaPapp · Answer

And disable or remove Soundflower, I&#x27;ve seen it cause plenty of problems.

TildeBee · Answer

However, folks, I&#x27;m pretty sure his MAIN problem is bad or loose RAM.So after he&#x27;s fixed the RAM, these other suggestions would be frosting on the cake, so to speak.

SeaPapp · Answer

Could be ~Bee, but since the OP has replaced the third party ram and no longer is reporting the three beeps I believe that the "frosting on the cake" is exactly what he needs now. Especially considering that the kexts listed are all known offenders. Hopefully he&#x27;ll report back.

SpringHeeledJim · Answer

I have switched sophus and soundflower off. Touch wood no problems since. *fingers crossed*Thanks for everyone&#x27;s help!

SpringHeeledJim · Answer

Sorry to reopen this thread but despite it not crashing for a fortnight after uninstalling Sophus, Soundflower and Littlesnitch. Since then I&#x27;m having numerous Kernels again.Interval Since Last Panic Report:  138752 secPanics Since Last Report:          4Anonymous UUID:                    B0DC80EF-4374-4DA7-8594-5199AE64CC19Sat Sep 21 14:38:01 2013panic(cpu 1 caller 0xffffff80002c4794): Kernel trap at 0xffffff800023f814, type 13&#x3D;general protection, registers:CR0: 0x000000008001003b, CR2: 0x0000000113912000, CR3: 0x00000000148a701e, CR4: 0x00000000000606e0RAX: 0xfbffff801d138080, RBX: 0xffffff80008c2028, RCX: 0xffffff801d138080, RDX: 0xffffff815f823dc0RSP: 0xffffff815f823d60, RBP: 0xffffff815f823db0, RSI: 0x0000000000000000, RDI: 0xffffff801d138070R8:  0xffffff7f81d1fe5b, R9:  0x0000000008412d7d, R10: 0x80000000148a701e, R11: 0x00000000cccccc00R12: 0xffffff815f823dc0, R13: 0x0000000000000000, R14: 0xfbffff801d138080, R15: 0xffffff801d138070RFL: 0x0000000000010006, RIP: 0xffffff800023f814, CS:  0x0000000000000008, SS:  0x0000000000000010CR2: 0x0000000113912000, Error code: 0x0000000000000000, Faulting CPU: 0x1Backtrace (CPU 1), Frame : Return Address0xffffff815f823a10 : 0xffffff8000220792 0xffffff815f823a90 : 0xffffff80002c4794 0xffffff815f823c40 : 0xffffff80002da55d 0xffffff815f823c60 : 0xffffff800023f814 0xffffff815f823db0 : 0xffffff800023f9be 0xffffff815f823df0 : 0xffffff8000217a35 0xffffff815f823e30 : 0xffffff800021996e 0xffffff815f823e80 : 0xffffff800021a1fd 0xffffff815f823ec0 : 0xffffff80002378f0 0xffffff815f823f00 : 0xffffff8000544d49 0xffffff815f823f50 : 0xffffff800054288e 0xffffff815f823f60 : 0xffffff80005cde98 0xffffff815f823fb0 : 0xffffff80002daa79 BSD process name corresponding to current thread: Google Chrome HeMac OS version:11G63bKernel version:Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5System model name: iMac12,1 (Mac-942B5BF58194151B)System uptime in nanoseconds: 13342134480468last loaded kext at 38381398186: com.apple.driver.AppleBluetoothHIDKeyboard          160.7 (addr 0xffffff7f81d66000, size 20480)loaded kexts:com.apple.filesystems.udf          2.2.1com.apple.driver.AppleHWSensor          1.9.5d0com.apple.driver.AudioAUUC          1.59com.apple.driver.AppleTyMCEDriver          1.0.2d2com.apple.driver.AGPM          100.12.75com.apple.driver.AppleMikeyHIDDriver          122com.apple.driver.AppleHDAHardwareConfigDriver          2.2.5a5com.apple.driver.AppleUpstreamUserClient          3.5.9com.apple.driver.AppleHDA          2.2.5a5com.apple.driver.AppleMikeyDriver          2.2.5a5com.apple.kext.ATIFramebuffer          7.3.2com.apple.filesystems.autofs          3.0com.apple.iokit.IOUserEthernet          1.0.0d1com.apple.driver.AppleSMCPDRC          5.0.0d8com.apple.iokit.IOBluetoothSerialManager          4.0.8f17com.apple.driver.AppleSMCLMU          2.0.1d2com.apple.driver.AppleMuxControl          3.1.33com.apple.Dont_Steal_Mac_OS_X          7.0.0com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8com.apple.driver.AudioIPCDriver          1.2.3com.apple.driver.ApplePolicyControl          3.1.33com.apple.driver.AppleLPC          1.6.0com.apple.driver.AppleBacklight          170.2.2com.apple.ATIRadeonX3000          7.3.2com.apple.driver.AppleMCCSControl          1.0.33com.apple.driver.AppleIntelHD3000Graphics          7.3.2com.apple.iokit.IOAHCISerialATAPI          2.0.3com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17com.apple.driver.AppleIRController          312com.apple.iokit.SCSITaskUserClient          3.2.1com.apple.driver.AppleUSBCardReader          3.0.6com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1com.apple.BootCache          33com.apple.driver.XsanFilter          404com.apple.iokit.IOAHCIBlockStorage          2.1.0com.apple.driver.AppleUSBHub          5.1.0com.apple.driver.AppleEFINVRAM          1.6.1com.apple.driver.AppleFWOHCI          4.9.0com.apple.driver.AirPort.Atheros40          505.67.1com.apple.iokit.AppleBCM5701Ethernet          3.2.4b8com.apple.driver.AppleAHCIPort          2.3.1com.apple.driver.AppleUSBEHCI          5.1.0com.apple.driver.AppleACPIButtons          1.5com.apple.driver.AppleUSBUHCI          5.1.0com.apple.driver.AppleRTC          1.5com.apple.driver.AppleHPET          1.7com.apple.driver.AppleSMBIOS          1.9com.apple.driver.AppleACPIEC          1.5com.apple.driver.AppleAPIC          1.6com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0com.apple.nke.applicationfirewall          3.2.30com.apple.security.quarantine          1.4com.apple.security.TMSafetyNet          8com.apple.driver.AppleIntelCPUPowerManagement          195.0.0com.apple.driver.AppleBluetoothHIDKeyboard          160.7com.apple.driver.AppleHIDKeyboard          160.7com.apple.driver.IOBluetoothHIDDriver          4.0.8f17com.apple.driver.DspFuncLib          2.2.5a5com.apple.kext.triggers          1.0com.apple.iokit.IOSurface          80.0.2com.apple.iokit.IOSerialFamily          10.0.5com.apple.iokit.IOFireWireIP          2.2.5com.apple.driver.AppleHDAController          2.2.5a5com.apple.iokit.IOHDAFamily          2.2.5a5com.apple.driver.AppleSMC          3.1.3d10com.apple.driver.IOPlatformPluginLegacy          5.0.0d8com.apple.iokit.IOAudioFamily          1.8.6fc18com.apple.kext.OSvKernDSPLib          1.3com.apple.driver.AppleGraphicsControl          3.1.33com.apple.driver.AppleSMBusPCI          1.0.10d0com.apple.driver.IOPlatformPluginFamily          5.1.1d6com.apple.driver.AppleBacklightExpert          1.0.4com.apple.driver.AppleThunderboltEDMSink          1.1.8com.apple.driver.AppleThunderboltEDMSource          1.1.8com.apple.kext.ATI6000Controller          7.3.2com.apple.kext.ATISupport          7.3.2com.apple.driver.AppleSMBusController          1.0.10d0com.apple.iokit.IONDRVSupport          2.3.4com.apple.driver.AppleIntelSNBGraphicsFB          7.3.2com.apple.iokit.IOGraphicsFamily          2.3.4com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1com.apple.iokit.IOBDStorageFamily          1.7com.apple.iokit.IODVDStorageFamily          1.7.1com.apple.iokit.IOCDStorageFamily          1.7.1com.apple.driver.AppleFileSystemDriver          13com.apple.driver.AppleThunderboltDPOutAdapter          1.8.5com.apple.driver.AppleThunderboltDPInAdapter          1.8.5com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.5com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.5com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17com.apple.iokit.IOBluetoothFamily          4.0.8f17com.apple.iokit.IOUSBHIDDriver          5.0.0com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1com.apple.iokit.IOUSBMassStorageClass          3.0.3com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1com.apple.driver.AppleUSBMergeNub          5.1.0com.apple.driver.AppleUSBComposite          5.0.0com.apple.driver.AppleThunderboltNHI          1.6.0com.apple.iokit.IOThunderboltFamily          2.0.3com.apple.iokit.IOUSBUserClient          5.0.0com.apple.iokit.IOFireWireFamily          4.4.8com.apple.iokit.IO80211Family          420.3com.apple.iokit.IOEthernetAVBController          1.0.1b1com.apple.iokit.IONetworkingFamily          2.1com.apple.iokit.IOAHCIFamily          2.0.8com.apple.driver.AppleEFIRuntime          1.6.1com.apple.iokit.IOHIDFamily          1.7.1com.apple.iokit.IOUSBFamily          5.1.0com.apple.iokit.IOSMBusFamily          1.1com.apple.security.sandbox          177.8com.apple.kext.AppleMatch          1.0.0d1com.apple.driver.DiskImages          331.7com.apple.iokit.IOStorageFamily          1.7.2com.apple.driver.AppleKeyStore          28.18com.apple.driver.AppleACPIPlatform          1.5com.apple.iokit.IOPCIFamily          2.7com.apple.iokit.IOACPIFamily          1.4Model: iMac12,1, BootROM IM121.0047.B1F, 4 processors, Intel Core i5, 2.7 GHz, 12 GB, SMC 1.71f22Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe, 512 MBMemory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435434473353313333394D2E4D3136464D44Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x859B, 0x435434473353313333394D2E4D3136464D44Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.67.5-P2PBluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial portsNetwork Service: Wi-Fi, AirPort, en1Serial ATA Device: ST31000528AS, 1 TBSerial ATA Device: HL-DT-STDVDRW  GA32N, 8.14 GBUSB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x850b, 0xfa200000 / 3USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2USB Device: External HDD, 0x1bcf  (Sunplus Innovation Technology Inc.), 0x0c31, 0xfa120000 / 5USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 7USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2USB Device: USB OPTICAL MOUSE, 0x15d9, 0x0a4d, 0xfd130000 / 5USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfd110000 / 3Today I&#x27;ve had 2.For both of them I was browsing online. The above log occured when I was watching a youtube video.

nbar · Answer

Highly probable it is a Faulty RAM module. Test each newly installed module, one at a time, to try and identify. Note it is not recommended to use modules of different capacities, though this would not cause your issue explicitly.