Over the past few days my Power Mac G5 Dual 2 GHz machine has been suffering intermittent kernel panics that were slowly increasing in frequency. The problem manifested itself by the display blanking (as if the computer were going to sleep) and coming back on several times within 15 seconds. The screen would then blank, the kernel would panic, and the fans would go into jet mode.
I ran the hardware diagnostics by putting in the "Mac OS X Install Disc 1" and holding down the Option key. I also fixed permissions on the disk by using "Disk Utility" during longer periods of uptime. No problems were found by "Disk Utility" and the hardware diagnostics (both the standard and extended tests) returned no problems.
After checking the "/Library/Logs/panic.log" file, I found that the kernel panics involved "com.apple.NVDAResman" -- the problem was related to the video card. On a hunch I purchased a can of compressed air, opened up the case, and blew out a very dusty video card. When I restarted, the kernel panics stopped. It appears that the kernel panics were due to a dusty video card (GeForce 6800 Ultra) that was overheating. I just thought I'd share my success story with others.
Included below are my system specifications and the panic.log file.
Michael.
I ran the hardware diagnostics by putting in the "Mac OS X Install Disc 1" and holding down the Option key. I also fixed permissions on the disk by using "Disk Utility" during longer periods of uptime. No problems were found by "Disk Utility" and the hardware diagnostics (both the standard and extended tests) returned no problems.
After checking the "/Library/Logs/panic.log" file, I found that the kernel panics involved "com.apple.NVDAResman" -- the problem was related to the video card. On a hunch I purchased a can of compressed air, opened up the case, and blew out a very dusty video card. When I restarted, the kernel panics stopped. It appears that the kernel panics were due to a dusty video card (GeForce 6800 Ultra) that was overheating. I just thought I'd share my success story with others.
Included below are my system specifications and the panic.log file.
Michael.
Code:
Hardware Overview:
Machine Name: Power Mac G5
Machine Model: PowerMac7,3
CPU Type: PowerPC G5 (3.0)
Number Of CPUs: 2
CPU Speed: 2 GHz
L2 Cache (per CPU): 512 KB
Memory: 3 GB
Bus Speed: 1 GHz
Boot ROM Version: 5.2.4f1
NVIDIA GeForce 6800 Ultra DDL:
Chipset Model: GeForce 6800 Ultra
Type: Display
Bus: AGP
Slot: SLOT-1
VRAM (Total): 256 MB
Vendor: nVIDIA (0x10de)
Device ID: 0x0040
Revision ID: 0x00a1
ROM Revision: 2130
Displays:
Cinema HD Display:
Display Type: LCD
Resolution: 1920 x 1200
Depth: 32-bit Color
Core Image: Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Display:
Online: No
Status: No display connected
Code:
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Sat Oct 22 09:06:22 2005
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000005A6C103E PC=0x0000000000934164
Latest crash info for cpu 0:
Exception state (sv=0x5A523000)
PC=0x00934164; MSR=0x00009030; DAR=0x5A6C103E; DSISR=0x42000000; LR=0x009427F4; R1=0x41C7B840; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x009427EC 0x0093FF50 0x0093497C 0x00934908 0x0093E188 0x0093DF90
0x00931D0C 0x00930B38 0x006D99F8 0x006C6BA8 0x006C8C28 0x006B0DF4 0x002E7A98 0x0008C858
0x000291C0 0x000233AC 0x000ABE2C 0x4E4F4E45
backtrace terminated - frame not mapped or invalid: 0xBFFF6C60
Kernel loadable modules in backtrace (with dependencies):
com.apple.NVDAResman(4.0.6)@0x6d8000
dependency: com.apple.iokit.IOPCIFamily(1.6)@0x472000
dependency: com.apple.iokit.IOGraphicsFamily(1.4)@0x69e000
dependency: com.apple.iokit.IONDRVSupport(1.4)@0x6c2000
com.apple.iokit.IONDRVSupport(1.4)@0x6c2000
dependency: com.apple.iokit.IOPCIFamily(1.6)@0x472000
dependency: com.apple.iokit.IOGraphicsFamily(1.4)@0x69e000
com.apple.iokit.IOGraphicsFamily(1.4)@0x69e000
dependency: com.apple.iokit.IOPCIFamily(1.6)@0x472000
Proceeding back via exception chain:
Exception state (sv=0x5A523000)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x5A6B6000)
PC=0x9000A738; MSR=0x0200F030; DAR=0xE12F2000; DSISR=0x42000000; LR=0x9000A67C; R1=0xBFFF6C60; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.2.0: Fri Jun 24 17:46:54 PDT 2005; root:xnu-792.2.4.obj~3/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x00095544 0x00095A5C 0x0002683C 0x000A819C 0x000ABB00
Proceeding back via exception chain:
Exception state (sv=0x5A523000)
PC=0x00934164; MSR=0x00009030; DAR=0x5A6C103E; DSISR=0x42000000; LR=0x009427F4; R1=0x41C7B840; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x009427EC 0x0093FF50 0x0093497C 0x00934908 0x0093E188 0x0093DF90
0x00931D0C 0x00930B38 0x006D99F8 0x006C6BA8 0x006C8C28 0x006B0DF4 0x002E7A98 0x0008C858
0x000291C0 0x000233AC 0x000ABE2C 0x4E4F4E45
backtrace terminated - frame not mapped or invalid: 0xBFFF6C60
*********
