Imac 5k stuck on apple logo screen after latest update

Hi - i have a magazine deadline and a major issue:
i've been having loads of kernel panics (see thread here Brand new imac 5k kernel panic) and having seen there was a new update figured it would be worth installing it to see if it fixed them as nothing so far suggested by apple support has helped. Once it had downloaded the update the OS said it needed to reboot to finish installation. It got half way through the loading bar on the apple logo screen and got stuck. I left it an hour, came back still nothing. Left it another hour and it was still just stuck half way. I rebooted into diagnostics and ran that and it said everything was fine but further reboots just get as far as halfway through the bar. I'm now stuck as the computer was only a month or so old and i hadn't yet set up back up on it. I was still in the process of getting everything configured and over from my old machine. Problem is I have a bunch of photos that were transferred on to it that i shot 2 weeks ago and I need them for a magazine deadline tomorrow and apple support options could only call me back on Thursday - if anyone can suggest anything i will be VERY grateful. I've already tried SMC and PRAM resets.

I did that, a fresh OS install and it worked for about 4 hours then i got a kernel panic
Anonymous UUID:       DE8E807F-E592-FD5D-3D3B-73B0BCCE57D4
Fri May 1 00:30:12 2015
*** Panic Report ***
panic(cpu 0 caller 0xffffff8018f6bf28): "a freed zone element has been modified in zone kalloc.64: expected 0xdeadbeefdeadbeef but found 0xdead9eefdeadbeef, bits changed 0x200000000000, at offset 40 of 64 in element 0xffffff80647c1c00, cookies 0x3f0011bcd6adda0a 0x53521f311ca5c19"@/SourceCache/xnu/xnu-2782.20.48/osfmk/kern/zalloc.c:496
Backtrace (CPU 0), Frame : Return Address
0xffffff83c1ef3730 : 0xffffff8018f2bda1
0xffffff83c1ef37b0 : 0xffffff8018f6bf28
0xffffff83c1ef38e0 : 0xffffff8018f34601
0xffffff83c1ef3910 : 0xffffff801945c513
0xffffff83c1ef3950 : 0xffffff801945f027
0xffffff83c1ef3980 : 0xffffff80194e958c
0xffffff83c1ef39f0 : 0xffffff80194e90d2
0xffffff83c1ef3a50 : 0xffffff7f9a79dcf6
0xffffff83c1ef3ad0 : 0xffffff7f9a7a25e8
0xffffff83c1ef3b20 : 0xffffff7f9a7a3350
0xffffff83c1ef3b60 : 0xffffff80195017cf
0xffffff83c1ef3bc0 : 0xffffff80194ff0c3
0xffffff83c1ef3d00 : 0xffffff8018fe21e7
0xffffff83c1ef3e10 : 0xffffff8018f3000c
0xffffff83c1ef3e40 : 0xffffff8018f149f3
0xffffff83c1ef3e90 : 0xffffff8018f2531d
0xffffff83c1ef3f10 : 0xffffff80190031ea
0xffffff83c1ef3fb0 : 0xffffff8019035396
      Kernel Extensions in backtrace:
         com.apple.iokit.IOAcceleratorFamily2(156.14)[BE7D765B-49C1-34F9-B75E-3EAF8A4062 A3]@0xffffff7f9a786000->0xffffff7f9a7f4fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[52E715FC-521D-3869-B2EA-5228FA4BEA34]@0xffffff 7f99724000
            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[82EAD591-67E3-39CB-A232-A8095CA30E92]@0 xffffff7f9a72b000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
14D136
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:     0x0000000018c00000
Kernel text base: 0xffffff8018e00000
__HIB text base: 0xffffff8018d00000
System model name: iMac15,1 (Mac-42FD25EABCABB274)
System uptime in nanoseconds: 19669481944459
last loaded kext at 1177984628424: com.apple.filesystems.ntfs 3.12 (addr 0xffffff7f9c01d000, size 376832)
last unloaded kext at 1401779154535: com.apple.filesystems.ntfs 3.12 (addr 0xffffff7f9c01d000, size 360448)
loaded kexts:
com.apple.filesystems.smbfs 3.0.1
com.apple.filesystems.afpfs 11.0
com.apple.nke.asp-tcp 8.0.0
com.apple.driver.AppleBluetoothMultitouch 85.3
com.apple.driver.AudioAUUC 1.70
com.apple.filesystems.autofs 3.0
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.iokit.IOBluetoothSerialManager 4.3.4f4
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.driver.AGPM 110.19.5
com.apple.driver.X86PlatformShim 1.0.0
com.apple.driver.ApplePlatformEnabler 2.2.0d4
com.apple.driver.AppleGraphicsDevicePolicy 3.7.7
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.kext.AMDFramebuffer 1.3.2
com.apple.driver.AppleIntelHD5000Graphics 10.0.6
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleHDA 272.18
com.apple.driver.AppleMikeyDriver 272.18
com.apple.AMDRadeonX4000 1.3.2
com.apple.driver.AppleHV 1
com.apple.driver.AppleThunderboltIP 2.0.2
com.apple.driver.AirPort.Brcm4360 930.37.3
com.apple.iokit.AppleBCM5701Ethernet 10.1.3
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.4f4
com.apple.driver.AppleSMCLMU 2.0.7d0
com.apple.driver.AppleLPC 1.7.3
com.apple.kext.AMD7000Controller 1.3.2
com.apple.driver.AppleIntelFramebufferAzul 10.0.6
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.driver.AppleMCCSControl 1.2.11
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.driver.AppleSDXC 1.6.5
com.apple.driver.AppleAHCIPort 3.1.2
com.apple.driver.AppleUSBXHCI 710.4.11
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.iokit.IOSCSIBlockCommandsDevice 3.7.5
com.apple.iokit.IOUSBMassStorageClass 3.7.2
com.apple.security.SecureRemotePassword 1.0
com.apple.driver.IOBluetoothHIDDriver 4.3.4f4
com.apple.driver.AppleMultitouchDriver 263.9.1
com.apple.kext.triggers 1.0
com.apple.iokit.IOSerialFamily 11
com.apple.iokit.IOSurface 97.4
com.apple.driver.AppleGraphicsControl 3.10.22
com.apple.driver.DspFuncLib 272.18
com.apple.kext.OSvKernDSPLib 1.15
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IO80211Family 730.60
com.apple.iokit.IOEthernetAVBController 1.0.3b3
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.4f4
com.apple.iokit.IOBluetoothFamily 4.3.4f4
com.apple.driver.AppleHDAController 272.18
com.apple.iokit.IOHDAFamily 272.18
com.apple.iokit.IOAudioFamily 203.3
com.apple.vecLib.kext 1.2.0
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.kext.AMDSupport 1.3.2
com.apple.driver.X86PlatformPlugin 1.0.0
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.IOPlatformPluginFamily 5.9.1d7
com.apple.AppleGraphicsDeviceControl 3.10.22
com.apple.iokit.IOAcceleratorFamily2 156.14
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.driver.AppleSMBusController 1.0.13d1
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.AppleThunderboltEDMSink 4.0.2
com.apple.iokit.IOUSBUserClient 705.4.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.5
com.apple.driver.AppleUSBHIDKeyboard 176.2
com.apple.driver.AppleHIDKeyboard 176.2
com.apple.iokit.IOUSBHIDDriver 705.4.0
com.apple.driver.AppleUSBMergeNub 705.4.0
com.apple.driver.AppleUSBComposite 705.4.9
com.apple.driver.CoreStorage 471.20.7
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.IOAHCIFamily 2.7.5
com.apple.iokit.IOUSBFamily 720.4.4
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.corecrypto 1.0
com.apple.kec.pthread 1
Model: iMac15,1, BootROM IM151.0207.B01, 4 processors, Intel Core i7, 4 GHz, 32 GB, SMC 2.22f16
Graphics: AMD Radeon R9 M290X, AMD Radeon R9 M290X, PCIe, 2048 MB
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x859B, 0x43543130323436344246313630422E433136
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x859B, 0x43543130323436344246313630422E433136
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, 0x142), 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 SSD SM1024F, 1 TB
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: HD-PCU2
Thunderbolt Bus: iMac, Apple Inc., 26.1

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