MacPro4 kernel panic help: Graphics card issue?

Thanks for the reply.

I have tried to do both of your suggestions before. I will do so again and see what happens.

I've reset PRAM and the SMC. Verified Hard Disk (is ok), verified permissions (nothing to fix) and I'm still getting this random crash. Also did the Hardware Test and it didn't find anything. When I reboot, sometimes I get nothing but but a black screen. Sometimes there is no chime or the chime will repeat indefinitely.

When it happens, the screen will flicker and my entire desktop is frozen. I can still move my mouse, but can't click on anything. The last couple of crashes now, I didn't even get a log in Console showing what the error was.

Help please!

update: tried to start in safe mode and it froze in the middle of the load bar

new error log:

Thu Dec 9 13:42:43 2010
panic(cpu 0 caller 0x4c6ae065): NVRM[0/5:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0x8a000000 0x4d1c1000 0x096000c1, D0, P0/2
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x421db888 : 0x21b50c (0x5d42fc 0x421db8bc 0x223974 0x0)
0x421db8d8 : 0x4c6ae065 (0x4c8c3dac 0x4c934600 0x4c8d2d5c 0x0)
0x421db978 : 0x4c7c95b3 (0x7302404 0x58da004 0x100 0x2a94be)
0x421db9c8 : 0x4c7c04af (0x58da004 0x100 0x421dba18 0xffffffff)
0x421db9f8 : 0x4ced856b (0x58da004 0x100 0x4bcd2cee 0x68d5a792)
0x421dbb38 : 0x4c7e81db (0x58da004 0x7463004 0x0 0x0)
0x421dbb78 : 0x4c6b72e3 (0x58da004 0x7463004 0x0 0x0)
0x421dbc18 : 0x4c6b38d8 (0x0 0x9 0x0 0x0)
0x421dbdc8 : 0x4c6b57be (0x0 0x600d600d 0x702a 0x421dbdf8)
0x421dbe98 : 0x4c649582 (0xc1d00026 0xaa910001 0x20802040 0x421dbee0)
0x421dbef8 : 0x41abe4eb (0x6bf3000 0x421dbf4c 0x0 0x7)
0x421dbf58 : 0x41abe696 (0x6b18000 0x41ac5b54 0x421dbf78 0x2a358d)
0x421dbf78 : 0x22fd09 (0x6b18000 0x0 0x870add4 0x227966)
0x421dbfc8 : 0x2a06cc (0x863ea0 0x0 0x10 0x6c0bca4)
Kernel Extensions in backtrace (with dependencies):
com.apple.driver.AGPM(100.12.19)@0x41abb000->0x41ac5fff
dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x4b7a3000
dependency: com.apple.iokit.IONDRVSupport(2.2)@0x4b719000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x41e59000
com.apple.nvidia.nv50hal(3.0.4)@0x4cdad000->0x4d1c0fff
dependency: com.apple.NVDAResman(3.0.4)@0x4c647000
com.apple.NVDAResman(3.0.4)@0x4c647000->0x4c935fff
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x41e59000
dependency: com.apple.iokit.IONDRVSupport(2.2)@0x4b719000
dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x4b7a3000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
10H574

Kernel version:
Darwin Kernel Version 10.5.0: Fri Nov 5 23:20:39 PDT 2010; root:xnu-1504.9.17~1/RELEASE_I386
System model name: MacPro4,1 (Mac-F221BEC8)

System uptime in nanoseconds: 581595399092
unloaded kexts:
com.apple.driver.AppleIntel8254XEthernet 2.1.1b7 (addr 0x4b259000, size 0x118784) - last unloaded 261886713815
loaded kexts:
com.apple.driver.AppleHWSensor 1.9.3d0 - last loaded 123774550596
com.apple.driver.AGPM 100.12.19
com.apple.Dont Steal_Mac_OSX 7.0.0
com.apple.driver.ACPI SMCPlatformPlugin 4.5.0d5
com.apple.driver.AppleLPC 1.4.12
com.apple.filesystems.autofs 2.1.0
com.apple.iokit.IOAHCIBlockStorage 1.6.3
com.apple.iokit.SCSITaskUserClient 2.6.5
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleFWOHCI 4.7.1
com.apple.driver.AppleUSBHub 4.1.7
com.apple.driver.Intel82574L 2.1.4b1
com.apple.driver.AppleAHCIPort 2.1.5
com.apple.driver.AppleUSBEHCI 4.1.7
com.apple.driver.AppleEFINVRAM 1.4.0
com.apple.driver.AppleUSBUHCI 4.1.5
com.apple.driver.AppleRTC 1.3.1
com.apple.driver.AppleHPET 1.5
com.apple.driver.AppleACPIButtons 1.3.5
com.apple.driver.AppleSMBIOS 1.6
com.apple.driver.AppleACPIEC 1.3.5
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 105.13.0
com.apple.security.sandbox 1
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.11
com.apple.driver.AppleIntelCPUPowerManagement 105.13.0
com.apple.nvidia.nv50hal 3.0.4
com.apple.NVDAResman 3.0.4
com.apple.iokit.IONDRVSupport 2.2
com.apple.iokit.IOGraphicsFamily 2.2
com.apple.driver.AppleSMC 3.1.0d3
com.apple.driver.IOPlatformPluginFamily 4.5.0d5
com.apple.driver.BroadcomUSBBluetoothHCIController 2.3.8f7
com.apple.driver.AppleUSBBluetoothHCIController 2.3.8f7
com.apple.iokit.IOBluetoothFamily 2.3.8f7
com.apple.driver.AppleUSBHIDKeyboard 141
com.apple.iokit.IOUSBHIDDriver 4.1.5
com.apple.driver.AppleHIDKeyboard 141
com.apple.driver.XsanFilter 402.1
com.apple.driver.AppleUSBMergeNub 4.1.5
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.5
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.iokit.IOFireWireFamily 4.2.6
com.apple.iokit.IOAHCISerialATAPI 1.2.5
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.5
com.apple.iokit.IOUSBUserClient 4.1.5
com.apple.iokit.IONetworkingFamily 1.10
com.apple.iokit.IOAHCIFamily 2.0.4
com.apple.iokit.IOUSBFamily 4.1.7
com.apple.driver.AppleEFIRuntime 1.4.0
com.apple.iokit.IOHIDFamily 1.6.5
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.TMSafetyNet 6
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 289
com.apple.iokit.IOStorageFamily 1.6.2
com.apple.driver.AppleACPIPlatform 1.3.5
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0

Hi William,

Applecare would've been my next step but I decided to try one last thing. I unplugged my mac and took it all apart, blew the dust off (general cleaning), plugged everything back in and it's been working fine ever since. Been about a week now. Not sure how that fixed it, but it looks like it did.

Thanks for the help!