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OS X crashes on PB Lombard due to RAM expansion System
If any of you have had problems with OS X crashing a lot (perhaps even during installation) on PowerBook Lombards, you are not alone. Lots of people have had this problem. It appears to be caused by the presence of RAM modules beyond the base 64MB. If you have a RAM upgrade in your top slot, OS X should work fine after you remove it.

It is unclear what is causing this problem, at first people said it was due to tighter memory tolerances, but then reports came in about even apple RAM upgrades causing the crash. Now it seems like it may be a lingering hardware bug that wasn't revealed by previous OS's. You can read lots more about this on the MacFixIt Forums in this thread.

Apple does not have a fix for this yet, in fact they appear to be denying that it is a problem, so I encourage anyone else experiencing this bug to fill out a bug report form.

Patri Friedman (
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Some, but not all..
Authored by: Anonymous on Apr 10, '01 10:00:42PM

My Powerbook G3/333 is running like a champ on OS X, with a 128 MB chip up top, not Apple installed.

So some, but not all are having the issue. perhaps we could pull and compare RAM info? Perhaps it is a similar issue to the G4 Firmware upgrade, something required for stable operation of the Mach kernel? I'm no tech wiz, just tossing ideas out. =)

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Re: Some, but not all..
Authored by: naddicott on Apr 16, '01 12:18:21AM

Not all, but quite a few.

The best theory out there right now is that there is a batch of Lombards out there with faulty CPU cards, and that OS X has brought out the worst side of this hardware issue. I had an affected Lombard, replaced my CPU card with one from and now I'm running totally freeze free with the same RAM that behaved so horribly before.

Besides replacing the CPU card, the only reasonable idea for a fix that's been circulating is a firmware upgrade from Apple. Depends on just how serious the problem on the bad CPU cards is I guess - it was minor enough that OS 9 only froze from it every other day or so on my system (compared with 30 minutes or less in OS X).

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