On Feb 25, 2013, at 4:09 PM, JohnV wrote:

What would be my next diagnostic step here?

Safe Boot by holding the Shift key at startup. This will ignore the boot cache files and rebuild them. Reboot normally after Safe Boot (no need to login, just hit "Restart"), and see if this solves problems.

If this doesn't solve the problem, you can try either global solutions which are a "shotgun" approach. Easiest would be to reinstall the latest Combo Update (10.4.11 PPC Combo in your case). Alternatively you might consider just upgrading to Leopard 10.5.8. In either case, run Disk Utility>Repair Disk & Repair Permissions prior to running the Combo Update or a System upgrade.

You could also try a more specific solution, such as examine the log files using Utilities>Console, or use Activity Monitor when the System is bogged down to see what's eating up the resources.

In a worst case scenario you may need to do a total reinstall, but this is unlikely.

Also, Firewire rarely causes problems, but USB is notorious for issues, and your USB externals could be the cause.

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