I can't seem to figure this one out, except i suspect that it has to do with USB something. My eMac seems to stall out randomly, moreso when I'm working with graphic intensive applications. I have only drawn this conclusion regarding graphic intensive applications because when ever I run photoshop, the computer will stall about 10x sooner than any other piece of software. Mind you the eMac will stall on its own wether or not I am using design software.
Tue Feb 13 16:04:11 2007
After reading the thread regarding how to obtain an answer quickly to a problem, I figured I needed to elaborate.
I have a G4 eMac, 1.25 Ghz, 1 Gig RAM, Maxtor 80 gig HD, Pioneer DVD-RW/CD-RW, ATI 32 MB video.
I've only got the Apple USB Keyboard plugged into the eMac, and the Apple optical mouse plugged into the keyboard. No airport cards, no addional third party hardware on top of the purchased machine.
I have looked through system.log and panic.log and the only thing I can find is this kernal panic error listed below.
Code:
Unresolved kernel trap(cpu 0): 0x400 - Inst access DAR=0x0000000002E04080 PC=0x0000000070617468
Latest crash info for cpu 0:
Exception state (sv=0x2B29CC80)
PC=0x70617468; MSR=0x40009030; DAR=0x02E04080; DSISR=0x40000000; LR=0x002531F0; R1=0x176A3770; XCP=0x00000010 (0x400 - Inst access)
Backtrace:
0x0025325C 0x00253040 0x2B27353C 0x2B272F74 0x002570E4 0x00256EBC 0x00257938 0x002531D8
0x00253040 0x0054AA18 0x2AE3D720 0x2AE3D45C 0x002570E4 0x00256EBC 0x00257938 0x00257FAC
0x00248164 0x00248128
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBCDCACMData(3.0.2)@0x2b271000
dependency: com.apple.iokit.IOUSBFamily(2.1.5)@0x53b000
dependency: com.apple.iokit.IOSerialFamily(6.0.1d20)@0x3da000
com.apple.driver.AppleUSBCDC(3.0.2)@0x2ae3c000
dependency: com.apple.iokit.IOUSBFamily(2.1.5)@0x53b000
com.apple.iokit.IOUSBFamily(2.1.5)@0x53b000
Proceeding back via exception chain:
Exception state (sv=0x2B29CC80)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2B360280)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 7.9.0:
Wed Mar 30 20:11:17 PST 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE_PPC
panic(cpu 0): 0x400 - Inst access
Latest stack backtrace for cpu 0:
Backtrace:
0x00083498 0x0008397C 0x0001EDA4 0x00090C38 0x0009402C
Proceeding back via exception chain:
Exception state (sv=0x2B29CC80)
PC=0x70617468; MSR=0x40009030; DAR=0x02E04080; DSISR=0x40000000; LR=0x002531F0; R1=0x176A3770; XCP=0x00000010 (0x400 - Inst access)
Backtrace:
0x0025325C 0x00253040 0x2B27353C 0x2B272F74 0x002570E4 0x00256EBC 0x00257938 0x002531D8
0x00253040 0x0054AA18 0x2AE3D720 0x2AE3D45C 0x002570E4 0x00256EBC 0x00257938 0x00257FAC
0x00248164 0x00248128
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBCDCACMData(3.0.2)@0x2b271000
dependency: com.apple.iokit.IOUSBFamily(2.1.5)@0x53b000
dependency: com.apple.iokit.IOSerialFamily(6.0.1d20)@0x3da000
com.apple.driver.AppleUSBCDC(3.0.2)@0x2ae3c000
*********
I have tried to change the port of the USB keyboard to see if it was a USB device that caused the problem - no luck. I'll try resetting the PRAM, but from what I've read it sounds like a hardware/logic board issue.
On a side note, once in a while the kernal panic is accompanied with distored display graphics. Specifically on stall the display produces groups of graphic artifacts over different areas of the screen. (Which leads me to believe this is possibly a display issue)
Thank you for any insight
-Aaron