 |
| Author | Post |
|---|
rapiddemon
Member
|
Posted: Fri Aug 24th, 2007 08:06 pm |
|
I was recently given an iMac G4 1GHz 17" that has random kernel panics. Sometimes they will occur before the machine is fully booted, sometimes several minutes after it has been running. I am pretty sure it is a bad logic board, but I wanted to get a second opinion.
Here is what I have tried so far, all to no avail:
1) Reset PRAM/PMU
2) Reseated RAM/Replace with known good RAM
3) Replaced Hard Drive (and obviously, re-installing OS X)
4) Re-applied proper amounts of thermal paste to all heat sensitive components and the edges of the heatpipe (where it joins the rest of the case)
5) Tried varying the RAM slots (in case a slot was bad)
6) Removed the Airport Extreme Card
7) Replaced the power Cord
The kernel panic log is as follows:
Wed Aug 8 15:14:43 2007
panic(cpu 0 caller 0x000A8B80): Uncorrectable machine check: pc =
0000000000082310, msr = 0000000040009030, dsisr = 40000000, dar =
0000000005759000
AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000
L2FIR = 0000000000000000, BusFir = 0000000000000000
Latest stack backtrace for cpu 0:
Backtrace:
0x00095564 0x00095A7C 0x00026838 0x000A8B80 0x000A7E10 0x000AB880
Proceeding back via exception chain:
Exception state (sv=0x385DCA00)
PC=0x00082310; MSR=0x40009030; DAR=0x05759000; DSISR=0x40000000;
LR=0x000821EC; R1=0x2274BA70; XCP=0x00000008 (0x200 - Machine check)
Backtrace:
0x000821EC 0x0007C9D0 0x002875D8 0x002A207C 0x0008A0C4 0x000611F0
0x00063108 0x000A85DC 0x000AB880
Exception state (sv=0x437CB280)
PC=0x8FE155B4; MSR=0x0000D030; DAR=0x05759000; DSISR=0x40000000;
LR=0x8FE1554C; R1=0xBFFFD2B0; XCP=0x0000000C (0x300 - Data access)
Kernel version:
Darwin Kernel Version 8.0.0: Sat Mar 26 14:15:22 PST 2005;
root:xnu-792.obj~1/RELEASE_PPC
If this is a logic board problem, is there any specific point at which it might have failed specifically? I had an iBook G4 with the common GPU problem and I was able to fix that simply by placing an aluminum shim under the heatsink, so if there is a common iMac G4 logic board problem as well that would be very useful information to me.
|
Gary
Administrator
|
Posted: Sun Aug 26th, 2007 01:17 pm |
|
| The backtrace does indicate a machine check error, but it can also be (more common) a bad drive or drive cable (note the data access error as well).
____________________
Gary Dailey
Daystar Technology
http://Daystar-Tech.com, http://Daystar-Store.com
email: gary@daystartechnology.com, chat: garydailey@mac.com
|
Current time is 11:54 am | |
|
|
|
|
