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Who said that I was using it as my main computer – or even using it at all? The point is that on some computers, a dead CMOS battery can cause symptoms you can't ignore. Not unless you are prepared to "ignore" throwing away your computer and buying a new one.

You do on a Quadra 660av. One symptom of a dead clock battery is that video won't work. You just get a dark screen. Most people find it hard to work without anything displayed on the screen.

The original Mac had an external access cover for the clock battery – very similar to battery covers on other pieces of consumer electronics. Having come up with this design, and then getting rid of it for desktops, is a bit like coming up with a "peanut butter jar" RAM upgrade hatch for the...