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baummer
Apr 28, 2008, 04:16 PM
I have an iBook G4 running stock 512MB memory. Last week I updated to 10.4.11 and immediately after it restarted, I kept getting recurring kernel panics. No rhyme or reason, it would occur randomly. It even occurred a couple of times at the login screen.

So, thinking I had a problem, and since I was planning on installing Leopard anyway, I popped in the install disk and did a disk utility check. Found some errors on the drive, and I told it to repair. I then proceeded to install Leopard by zeroing out the drive and installing fresh.

After installation completed, and running Leopard for not even 10 minutes I was greeted with a kernel panic. Now I get them periodically. Sometimes I'll get 4 or 5 in the span of half an hour. Other times I can use it for hours without issue. Disk utility says everything is kosher, so I'm not sure what to do next. I thought it was a software problem, but doesn't seem to be.

Below is my panic log. I would appreciate any help or guidance.


Mon Apr 28 14:04:04 2008
panic(cpu 0 caller 0x000AED04): "Uncorrectable machine check: pc = 0000000000C1598C, msr = 0000000000149030, dsisr = 42000000, dar = 00000000E002E000\n" " AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000\n" " L2FIR = 0000000000000000, BusFir = 0000000080000000\n"@/SourceCache/xnu/xnu-1228.4.31/osfmk/ppc/trap.c:975
Latest stack backtrace for cpu 0:
Backtrace:
0x0009B478 0x0009BE1C 0x00029DD4 0x000AED04 0x000AEF84 0x000B2A78
Proceeding back via exception chain:
Exception state (sv=0x16f7b500)
PC=0x00C1598C; MSR=0x00149030; DAR=0xE002E000; DSISR=0x42000000; LR=0x00C15B3C; R1=0x1F99FC70; XCP=0x00000008 (0x200 - Machine check)
Backtrace:
0x00000005 0x00C15B3C 0x00BD8EA0 0x00356AC8 0x00355D2C 0x00355DE0
0x000B05D4
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AirPortBrcm43xx(312.46.51)@0xbcf000->0xcfbfff
dependency: com.apple.iokit.IO80211Family(211.1)@0xbab000
dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x7a3000
dependency: com.apple.iokit.IONetworkingFamily(1.6.0)@0xb4a000
Exception state (sv=0x13192280)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9C7010

Kernel version:
Darwin Kernel Version 9.2.2: Tue Mar 4 21:23:43 PST 2008; root:xnu-1228.4.31~1/RELEASE_PPC
System model name: PowerBook6,7


Thanks in advance! I don't have Apple Care and if it's a failed hardware component, I'm not sure I could afford to replace it. Definitely not the logic board. Suggestions to that end are sought as well.



yadmonkey
Apr 28, 2008, 11:32 PM
Hopefully it's RAM because that's the easiest and cheapest thing to replace...

Do you have the Apple Hardware Test which came with your iBook? If so, boot to that and run the hardware tests - might reveal something. You might also try booting into safe mode and running Rember (http://www.macupdate.com/info.php/id/15837/rember), which is a good memory test.