What is the kernel panic you are getting? Without more information we can't help.
Thanks for the reply man. Heres the panic report. It cycles through all 4 cpu not just 1.
Anonymous UUID: A6329F10-DDE2-F4B2-09B1-FA75F44154E2
Tue May 31 03:43:46 2016
*** Panic Report ***
panic(cpu 0 caller 0xffffff8026120180): "Invalid queue element pointers for 0xffffff804617c000: next 0 prev 0"@/Library/Caches/com.apple.xbs/Sources/xnu/xnu-3248.50.21/osfmk/kern/queue.h:241
Backtrace (CPU 0), Frame : Return Address
0xffffff91a4f93d50 : 0xffffff80260dab12
0xffffff91a4f93dd0 : 0xffffff8026120180
0xffffff91a4f93e10 : 0xffffff802611c842
0xffffff91a4f93ef0 : 0xffffff802667e4d6
0xffffff91a4f93f10 : 0xffffff7fa8832d0c
0xffffff91a4f93f40 : 0xffffff80266b2f21
0xffffff91a4f93f80 : 0xffffff80266b3016
0xffffff91a4f93fb0 : 0xffffff80261c9017
Kernel Extensions in backtrace:
com.apple.driver.AppleGraphicsDevicePolicy(3.12.7)[2AA6712C-930F-3981-B80C-2BDCA8412C05]@0xffffff7fa882e000->0xffffff7fa8839fff
dependency: com.apple.driver.AppleGraphicsControl(3.12.8)[C57F5F56-2229-365F-9765-F24AA4687584]@0xffffff7fa882b000
dependency: com.apple.iokit.IOACPIFamily(1.4)[5D7574C3-8E90-3873-BAEB-D979FC215A7D]@0xffffff7fa6a11000
dependency: com.apple.iokit.IOPCIFamily(2.9)[D8216D61-5209-3B0C-866D-7D8B3C5F33FF]@0xffffff7fa6936000
dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[172C2960-EDF5-382D-80A5-C13E97D74880]@0xffffff7fa6d2f000
dependency: com.apple.AppleGraphicsDeviceControl(3.12.8)[81C2784E-285A-38A7-A16E-515DCB816E0A]@0xffffff7fa6d86000
BSD process name corresponding to current thread: kernel_task
Boot args: dart=0
Mac OS version:
15F34
Kernel version:
Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64
Kernel UUID: 7E7B0822-D2DE-3B39-A7A5-77B40A668BC6
Kernel slide: 0x0000000025e00000
Kernel text base: 0xffffff8026000000
__HIB text base: 0xffffff8025f00000
System model name: iMac16,2 (Mac-FFE5EF870D7BA81A)
System uptime in nanoseconds: 3566496700
last loaded kext at 3538064921: com.apple.driver.AppleGraphicsDevicePolicy 3.12.7 (addr 0xffffff7fa882e000, size 49152)
loaded kexts:
expressvpn.tun 1.0
com.insanelymac.driver.AppleIntelE1000e 3.3.3
org.netkas.driver.FakeSMC 1707
com.apple.driver.AppleGraphicsDevicePolicy 3.12.7
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleTyMCEDriver 1.0.2d2
com.apple.driver.AppleHDAHardwareConfigDriver 274.9
com.apple.driver.AppleHDA 274.9
com.apple.driver.pmtelemetry 1
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.driver.AppleMCCSControl 1.2.13
com.apple.iokit.IOBluetoothSerialManager 4.4.5f3
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.GeForce 10.1.0
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleHV 1
com.apple.iokit.CSRBluetoothHostControllerUSBTransport 4.4.5f3
com.apple.driver.AppleLPC 3.1
com.apple.nvidia.NVDAStartup 10.1.0
com.apple.driver.AppleFIVRDriver 4.1.0
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.driver.AppleIntelFramebufferCapri 10.1.4
com.apple.iokit.SCSITaskUserClient 3.7.7
com.apple.iokit.IOAHCIBlockStorage 2.8.5
com.apple.driver.AppleFileSystemDriver 3.0.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.BootCache 38
com.apple.driver.AppleFWOHCI 5.5.4
com.apple.driver.AirPort.Atheros40 700.74.5
com.apple.driver.AppleAHCIPort 3.1.8
com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1
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.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.driver.AppleGraphicsControl 3.12.8
com.apple.kext.triggers 1.0
com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1
com.apple.driver.usb.cdc 5.0.0
com.apple.driver.usb.networking 5.0.0
com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1
com.apple.driver.DspFuncLib 274.9
com.apple.kext.OSvKernDSPLib 525
com.apple.driver.AppleSMBusController 1.0.14d1
com.apple.iokit.IOSMBusFamily 1.1
com.apple.iokit.IOSurface 108.2.1
com.apple.iokit.IOSerialFamily 11
com.apple.nvidia.driver.NVDAGK100Hal 10.1.0
com.apple.nvidia.driver.NVDAResman 10.1.0
com.apple.driver.CoreCaptureResponder 1
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.5f3
com.apple.iokit.IOBluetoothFamily 4.4.5f3
com.apple.driver.AppleHDAController 274.9
com.apple.iokit.IOHDAFamily 274.9
com.apple.iokit.IOAudioFamily 204.4
com.apple.vecLib.kext 1.2.0
com.apple.driver.AppleSMBusPCI 1.0.14d1
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.IOPlatformPluginFamily 6.0.0d7
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.iokit.IOAcceleratorFamily2 205.10
com.apple.AppleGraphicsDeviceControl 3.12.8
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.iokit.IOFireWireIP 2.2.6
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.driver.AppleXsanScheme 3
com.apple.iokit.IOAHCISerialATAPI 2.6.2
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7
com.apple.iokit.IOFireWireFamily 4.6.1
com.apple.iokit.IO80211Family 1110.26
com.apple.driver.corecapture 1.0.4
com.apple.iokit.IOAHCIFamily 2.8.1
com.apple.iokit.IOUSBFamily 900.4.1
com.apple.driver.usb.AppleUSBEHCI 1.0.1
com.apple.iokit.IONetworkingFamily 3.2
com.apple.driver.usb.AppleUSBXHCIPCI 1.0.1
com.apple.driver.usb.AppleUSBXHCI 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.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 417.4
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
Model: iMac16,2, BootROM IM162.0206.B00, 4 processors, Intel Core i7, 3.50 GHz, 12 GB, SMC 2.11f14
Graphics: NVIDIA GeForce GT 640, NVIDIA GeForce GT 640, PCIe, 2048 MB
Memory Module: BANK0/DIMM0, 2 GB, DDR3, 1333 MHz, Micron Technology, 16JTF25664AZ-1G4F1F1
Memory Module: BANK1/DIMM0, 4 GB, DDR3, 1333 MHz, Crucial Technology, BLS4G3D1339DS1S00.M1
Memory Module: BANK0/DIMM1, 2 GB, DDR3, 1333 MHz, Micron Technology, 16JTF25664AZ-1G4F1F1
Memory Module: BANK1/DIMM1, 4 GB, DDR3, 1333 MHz, Crucial Technology, BLS4G3D1339DS1S00.M1
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x3112), Atheros 9380: 4.0.74.0-P2P
Bluetooth: Version 4.4.5f3 17904, 3 services, 26 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: TOSHIBA DT01ACA200, 2 TB
Serial ATA Device: Samsung SSD 840 EVO 500GB, 500.11 GB
Serial ATA Device: HL-DT-ST BDDVDRW UH12NS29
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: USB2.0 Hub
USB Device: USB2.0 Hub
USB Device: USB2.0 Hub
USB Device: USB2.0 Hub
USB Device: Microsoft® 2.4GHz Transceiver v7.0
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: USB 3.0 Bus
USB Device: 4-Port USB 3.0 Hub
USB Device: USB3.0 Hub
USB Device: USB3.0 Hub
USB Device: 4-Port USB 3.0 Hub
USB Device: CSR8510 A10
Thunderbolt Bus: