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I got bit by the 5.1.5f1 Uni Processor Update on a 1.6G Mac, but not as bad as some. See the massive thread at the Apple boards. Funny, now the thread is locked. So apple released a fix today, and I’ve applied it– we’ll see what this does. Bottom line: Never install a firmware update for no reason other than “..improves general system reliability…” I did learn about Archive Installs, which I never knew about before.