Re: Kernel Panic during startup on iMac
Re: Kernel Panic during startup on iMac
- Subject: Re: Kernel Panic during startup on iMac
- From: Al Ciplickas <email@hidden>
- Date: Tue, 7 Aug 2007 21:39:55 -0700
OK, these hints are getting me somewhere:
1-I don't have any 3rd party KEXT enabled (that I am aware of).
3-no 3rd party RAM (only the 2 memory modules that Apple installed =
1GB)
4-removed all 'other software'
5-no 'other' hardware.
2-so I opened the case and removed the memory modules, and Swapped
them (made sure of seating)
-- that seemed to allow the system to stay up.
-- other utilities (Apple's) started to crash at random (like
SoftwareUpdate and SystemPrefs and AddressBook)
-- next, I removed the memory from the front slot (#0?) and now it
appears that system and other programs are running well (though a bit
slower in response, as expected).
-- conclusion so far: I have a bad memory module. It apparently
was not found by the startup tests.
I appreciate all the opinions and advice that everyone gave. Makes
me feel part of a team.
Thanks. -Al-
On Aug 7, 2007, at 7:47 PM, Terry Lambert wrote:
Insufficient information.
The whole panic message is needed, along with version information
to even start to diagnose this. In probability order:
(1) Third party KEXT not intended for this version of the OS and/or
with bug
(2) His RAM has come unseated due to vibration/thermal expansion/
whatever other environmental conditions
(3) Third party RAM that can't switch it's clock rate back up in
spec after it's been clocked down by power management once, or some
other issue that is the reason it failed Apple certification
(4) Other Software
(5) Other hardware
He needs to file a bug report with the version of the OS, or just
take the thing in for service. A bug report might cost him less
(nothing) for some problems, but take longer than paying for service.
-- Terry
On Aug 7, 2007, at 7:30 PM, Michael Cashwell wrote:
It sure sounds like a motherboard failure. Perhaps someone with
more info could decompose the error message further. I doubt that
the Genius Bar is setup to do actual component-level diagnostics
but they could help with repair.
I don't suppose there was any unusual event when this started?
Lighting, power surge, etc.?
But at least you know at this point that it's a hardware issue and
that software updates and rebuilds aren't likely to solve it.
Good luck!
-Mike
On Aug 7, 2007, at 4:30 PM, Al Ciplickas wrote:
Thanks, Mike.
So I tried OF at startup and got these lines:
bad Bus Info CRC-16
Apple PowerMac8, 2 5.2.5f1 BootROM built on 04/06/05 at 12:46:02
etc.
Now, I assume the first line is a hint that I have a "bad Bus"
somewhere (cpu data bus?).
Would the Genius Bar (with an appointment) be able to do any
hardware diagnostics?
-Al-
On Aug 7, 2007, at 1:24 PM, Michael Cashwell wrote:
On Aug 7, 2007, at 4:07 PM, Al Ciplickas wrote:
Mike, I'll try the D feature on the CD _if_ I can ever get it
to work, but this system is 2 years old. Would the developer
MacOS Tiger DVD have the same feature?
I do not think so. Each system's diagnostic tool is tightly
coupled to that hardware. I've never had any success using
anything other than the install/restore disks originally
supplied. You might be able to take the machine to a Genius Bar
(with an appointment) and they might have the right disks.
Can I do anything in the Open Firmware screen to do testing?
This is just my understanding. I have no authoritative data here...
Not of the sort that the diagnostic tools do. There quite a bit
of OF/EFI code being pulled from the disks in those cases that's
not present in the boot FLASH. (The disks supply more than just
a UI to run the tests.)
-Mike
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