After 10.6.4 Update Black Screen

Hello,
I have run into something that is driving me crazy. I have a Mac Pro Early 2008 and decided to do the 10.6.4 update. Update goes through, after chime and Apple Logo, it goes black and video becomes unresponsive, not output from video card. However you can hear everything booting up in the background (Skype, Volume Up and Down Sound from keyboard, etc). I have used Time Machine to Restore and now I am back on 10.6 and its okay. I have a ATI Radeon HD 4870 as a video card, so I don't know if its a video driver issue, but I can't figure it out. I have tried resetting PRAM, doing simple troubleshooting steps. Any help and suggestions would be greatly appreciated. I have not tried it with another monitor for I don't have one to test, my current monitor is a 30" Samsung SyncMaster 305t plus hooked up via DVI. Any help or suggestions would be appreciated.
Thank you

If any of you have a flashed 4870, then that is your problem.
Many of the flashed cards don't play well with OS X past 10.6.2.
Specifically, the XFX 4870 1 Gig with model ZWFL or ZWFC are total junk in any version of OSX other than 10.6, 10.6.1, or 10.6.2.
There are various fixes on MacRumours.
If your flashed card is an Asus model, placing a DVI to VGA adapter on 2nd DVI port may solve issue. Or, there is a "Dual DVI" fix listed at MR which does similar thing.
If these issues are with the ORIGINAL Apple OEM 4870 with one DVI port and one MDP, you need to contact Apple. No reason for those to have this issue.

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Interval Since Last Panic Report: 5 sec
Panics Since Last Report:          1
Anonymous UUID:
Sat Apr 6 03:00:26 2013
panic(cpu 2 caller 0xffffff7f84f957f2): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff8080fc1000 0x0a5480a2, D0, P3/4
Backtrace (CPU 2), Frame : Return Address
0xffffff8080bbaf80 : 0xffffff800481d626
0xffffff8080bbaff0 : 0xffffff7f84f957f2
0xffffff8080bbb0b0 : 0xffffff7f850923b9
0xffffff8080bbb110 : 0xffffff7f8509242e
0xffffff8080bbb180 : 0xffffff7f853b8c82
0xffffff8080bbb2b0 : 0xffffff7f850b8fe8
0xffffff8080bbb2f0 : 0xffffff7f84f9d567
0xffffff8080bbb3a0 : 0xffffff7f84f9b05a
0xffffff8080bbb5a0 : 0xffffff7f84f9c983
0xffffff8080bbb670 : 0xffffff7f8601a790
0xffffff8080bbb730 : 0xffffff7f86045f98
0xffffff8080bbb7b0 : 0xffffff7f8602d308
0xffffff8080bbb810 : 0xffffff7f8602dbe9
0xffffff8080bbb860 : 0xffffff7f8602e09b
0xffffff8080bbb8d0 : 0xffffff7f8602e8d1
0xffffff8080bbb910 : 0xffffff7f85ffa34f
0xffffff8080bbba90 : 0xffffff7f8602ae39
0xffffff8080bbbb50 : 0xffffff7f85ff8de8
0xffffff8080bbbba0 : 0xffffff8004c650c9
0xffffff8080bbbbc0 : 0xffffff8004c66670
0xffffff8080bbbc20 : 0xffffff8004c6408f
0xffffff8080bbbd70 : 0xffffff80048984a1
0xffffff8080bbbe80 : 0xffffff8004820aed
0xffffff8080bbbeb0 : 0xffffff8004810448
0xffffff8080bbbf00 : 0xffffff800481961b
0xffffff8080bbbf70 : 0xffffff80048a5dd6
0xffffff8080bbbfb0 : 0xffffff80048cdd43
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(8.1)[A26D2A3D-C06F-3A0F-BCFF-901A98C93C3D]@0xffffff7f84f38 000->0xffffff7f85245fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f84ea3000
            dependency: com.apple.iokit.IONDRVSupport(2.3.7)[38C214C0-83C8-3594-8A4C-DC6AC3FEC163]@0xff ffff7f84f24000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[74E3E50F-E50A-3073-8C96-06F854292A91]@0 xffffff7f84ee1000
         com.apple.nvidia.nv50hal(8.1)[5F021999-8B18-3BD5-9B98-90617E638A63]@0xffffff7f8 5253000->0xffffff7f85574fff
            dependency: com.apple.NVDAResman(8.1.0)[A26D2A3D-C06F-3A0F-BCFF-901A98C93C3D]@0xffffff7f84f 38000
            dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f84ea3000
         com.apple.GeForce(8.1)[A15BB65E-3501-340F-87CB-2FD2BAD33E35]@0xffffff7f85fe7000 ->0xffffff7f860b3fff
            dependency: com.apple.NVDAResman(8.1.0)[A26D2A3D-C06F-3A0F-BCFF-901A98C93C3D]@0xffffff7f84f 38000
            dependency: com.apple.iokit.IONDRVSupport(2.3.7)[38C214C0-83C8-3594-8A4C-DC6AC3FEC163]@0xff ffff7f84f24000
            dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f84ea3000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[74E3E50F-E50A-3073-8C96-06F854292A91]@0 xffffff7f84ee1000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
12D78
Kernel version:
Darwin Kernel Version 12.3.0: Sun Jan 6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64
Kernel UUID: 3EB7D8A7-C2D3-32EC-80F4-AB37D61492C6
Kernel slide:     0x0000000004600000
Kernel text base: 0xffffff8004800000
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 2850698695318
last loaded kext at 22285094662: com.apple.driver.AudioAUUC          1.60 (addr 0xffffff7f86293000, size 32768)
last unloaded kext at 230795989184: com.apple.driver.AppleUSBUHCI          5.2.5 (addr 0xffffff7f8582e000, size 65536)
loaded kexts:
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AGPM          100.12.87
com.apple.iokit.IOBluetoothSerialManager          4.1.3f3
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleHDA          2.3.7fc4
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.driver.AppleIntelHDGraphics          8.1.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.3f3
com.apple.GeForce          8.1.0
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.driver.AppleMikeyDriver          2.3.7fc4
com.apple.driver.AppleSMCPDRC          1.0.0
com.apple.driver.AppleSMCLMU          2.0.3d0
com.apple.driver.ApplePolicyControl          3.3.0
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleIntelHDGraphicsFB          8.1.0
com.apple.driver.AppleLPC          1.6.0
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleMuxControl          3.3.0
com.apple.driver.AppleMCCSControl          1.1.11
com.apple.driver.SMCMotionSensor          3.0.3d1
com.apple.driver.AppleUSBTCButtons          237.1
com.apple.driver.AppleUSBCardReader          3.1.7
com.apple.driver.AppleIRController          320.15
com.apple.driver.AppleUSBTCKeyboard          237.1
com.apple.iokit.SCSITaskUserClient          3.5.5
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          2.3.1
com.apple.driver.AppleFWOHCI          4.9.6
com.apple.driver.AirPort.Brcm4331          614.20.16
com.apple.driver.AppleAHCIPort          2.5.1
com.apple.driver.AppleUSBHub          5.5.5
com.apple.iokit.AppleBCM5701Ethernet          3.6.0b1
com.apple.driver.AppleUSBEHCI          5.5.0
com.apple.driver.AppleEFINVRAM          1.7
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleACPIButtons          1.7
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.7
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
com.apple.nke.applicationfirewall          4.0.39
com.apple.security.quarantine          2
com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.driver.DspFuncLib          2.3.7fc4
com.apple.iokit.IOAudioFamily          1.8.9fc11
com.apple.kext.OSvKernDSPLib          1.6
com.apple.iokit.IOSurface          86.0.4
com.apple.iokit.IOBluetoothFamily          4.1.3f3
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.3f3
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.nvidia.nv50hal          8.1.0
com.apple.NVDAResman          8.1.0
com.apple.driver.AppleHDAController          2.3.7fc4
com.apple.iokit.IOHDAFamily          2.3.7fc4
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.AppleSMBusPCI          1.0.11d0
com.apple.driver.IOPlatformPluginFamily          5.3.0d51
com.apple.kext.triggers          1.0
com.apple.driver.AppleGraphicsControl          3.3.0
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.IONDRVSupport          2.3.7
com.apple.driver.AppleSMBusController          1.0.11d0
com.apple.iokit.IOGraphicsFamily          2.3.7
com.apple.driver.AppleSMC          3.1.4d2
com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.5
com.apple.iokit.IOUSBMassStorageClass          3.5.1
com.apple.driver.AppleUSBMultitouch          237.3
com.apple.iokit.IOUSBHIDDriver          5.2.5
com.apple.driver.AppleUSBMergeNub          5.5.5
com.apple.driver.AppleUSBComposite          5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.5
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.iokit.IOAHCISerialATAPI          2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IO80211Family          522.4
com.apple.iokit.IOAHCIFamily          2.3.1
com.apple.iokit.IOUSBUserClient          5.5.5
com.apple.iokit.IOEthernetAVBController          1.0.2b1
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOUSBFamily          5.5.5
com.apple.driver.AppleEFIRuntime          1.7
com.apple.iokit.IOHIDFamily          1.8.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220.2
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          345
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.7
com.apple.iokit.IOPCIFamily          2.7.3
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i5, 2.53 GHz, 4 GB, SMC 1.58f17
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334648302D4346382020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334648302D4346382020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.100.16)
Bluetooth: Version 4.1.3f3 11349, 2 service, 11 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST9500325ASG, 500.11 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 5
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 4
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 7
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

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Message was edited by: cornelius

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This was confirmed as the issue when I tested a friend's original RAM from the same age iMac and the machine worked perfectly.
I then ordered 2x 4gb Crucial memory (upgrade from the 2x 2gb already installed) but kept getting kernal errors and RAM integrity check errors so the modules were returned and replaced by crucial.
Prior to returning, I attempted to reinstall a fresh copy of mavericks, but the hard drive failed to completely format, and then the OS install also failed so the machine currently now has no operating system. However before returning the ram the machine would boot up and connect to the internet to attempt to download the OS again.
The replacements have now arrived, but after installing the machine won't even boot. First attempt to start there is a drive noise, and the fans run, but no chime and a black screen. If I force shutdown and try again the drive noise happens twice and the fans run, but the same outcome.
If I remove the RAM I still get the single bleep, and once of all of the times I've removed and reseated the RAM I've had a triple beep integrity check fail.
Any help would be massively appreciated. Lost now as to whether the issue is with crucials RAM or the iMac itself.
Thanks

Do you still have the old ram? Was orig sticks of ram bad? What happens if you put only one stick of the orig ram back in ?

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