Oops! It just "burped" at me - a short, low (not bong) beep, and the cursor locked up, so still a problem with "Lonely Mac" syndrome. Maybe memory as Phreakout suggested earlier?

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Where did this term "Lonely Mac syndrome" come from? I doubt it is the memory. Typically if the memory were bad, it wouldn't pass the start-up check. This would typically be a software problem, or a grounding problem, something is shorting, which could be caused by a leaky capacitor. Not sure why it would function for a while though, and then short, then startup fine, as nothing changes.