Marc Sira <[EMAIL PROTECTED]> replied to:
>>Actually, I run several differently configured systems on multiple drives
>>and partitions. "Extensions off" also failed with all OS 8.6 bootup
>>attempts, also from different partitions. These would change the load order
>>and ram usage considerably so your theory is as good/bad/facile as mine ;).
>>There were also several others who suddenly had OS 8.6 upgrade problems on
>>desktops on another digest, but too few to draw conclusions--hence I
>>speculate. I also keep a "clean" installed system without 3rd party
>>extensions on a separate partition to reference all trials.
>
> Actually, different extensions sets won't change anything if it's part of
> the OS itself that's loading into a suspect word of memory (generally
> something in the system file, though some of those "extensions" are pretty
> darn core these days).
Good points. But the G3-tower bus error occurred (my memory is imperfect)
2/3 through an extensions load (if on) and late in the OS system load (if
ext off).
> Shift-booting changes a lot less than you might think, too; it again
> doesn't affect the OS proper (which is ill-defined these days, but you can
> be sure it's getting pretty big if of nothing else),.<snip>...(a lot of dead
> code still gets loaded too for this reason, especially drivers for hardware
> native to other Mac models).
> The three architectures will load different driver sets, and possibly even
> different non-driver code segments that are peers to the same user function
> in some cases, so it's not as unlikely as it first appears. I regret that I
> don't recall from your initial description how far the 2400 got in that
> boot sequence, but it probably either died at the start (disk driver
> partially corrupted but still works on the G3's, not very likely but not
> unheard of) or the early middle (loading device drivers, more likely).
I said:
>> <snip> I even
>> tossed System, Sys Resources, Finder, Sys & Finder prefs and dirty copied
>> the first three from another mint OS 8.6 partition. The reworked, optimized
>> 6.4g ran like blazes in my G3-3400 (or 3500) but just would show a grey
>> screen or flashing ? on the 2400. External SCSI HDs would also run the 3400
>> but would freeze on the 2400 or just show up as ?.
On the 2400, I never could get past that "blinkin'" question mark (if lucky)
or just had a cursorless gray screen (if unlucky). Hot and cold restarts
varied between these two scenarios. Problem HD (using Apple 1.7.3 drivers)
could be brought up in SCSI mode (which is how I used Disk Warrior to
finally rewrite the directory).
> Apple recommends those things that make technical support easiest or even
> possible for them, and that's the best global policy they could have (which
> doesn't make it the best local policy for everyone). My own install policy
> (that which has led to so few problems in the last decade :) is generally
> to install somewhere else and drag over those things that I know to be
> important, but the main point (which clean installs address only by
> default) is to groom the System Folder afterward and look for installer
> mistakes and especially leftover cruft. And the other main point is just to
> make sure the disk is free of directory damage, reasonably unfragmented,
> and with an up-to-date driver.
Again, good points, EXACTLY what I do in full. I rarely use "Easy Install".
I keep a reference system on a separate partition with every computer to
effect "dirty install" drag/copy repairs. This was the first time ever that
nothing worked. The technique has revived Powerbooks with blown directories
in the simpler Sys 7 era while in countries that had close to zero Macs. I
agree our own "local policy" procedures would be a nightmare for Apple Tech
to support.
---
Sidney Ho
[EMAIL PROTECTED]
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