I am having serious problems running OS 9.1 or 9.2 on my Power Tower Pro 225. It runs fine for a few days and then on startup it says something like 'This hard disk won't work with this OS- please upgrade'.
I couldn't find anything online that said I couldn't run OS 9 on this machine. Anybody know that to be a fact? What is the most recent Mac OS to work with this machine?
Do I need to go back to OS 8.6?
I think your problem here is a hard disk driver conflict.
The original PowerComputing machines shipped with Hard Disk Toolkit-formatted drives. I had nothing but problems with this and at every opportunity I would completely reformat the hard drive by booting up with an Apple system CD, use Disk Utility to repartition the drive, then rename the resulting Untitled disk on the desktop to "Macintosh HD".
So, if you have used this PowerTower Pro from Day 1 and never replaced the boot hard drive nor ever reformatted it with Apple drivers, back up your critical data and do so.
OS9.1 should work fine on that machine, you just need to boot from an OS9 CD, repartition the HD so that Apple drivers are on there, and reinstall everything from scratch (or selectively copy what you need).
Once you are happily running from OS9.1, you can go to http://www.os9forever.com and use their OS9 Helper app to update to 9.2.1 and then 9.2.2. It is a *hack* so it's not supported in any way.
James
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