Last time mine showed the Red Rings was the day the Crimson Map Pack came out for Halo 4. It got a little too hot and shut off in the middle of a match on Harvest.
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Back in '10, I think. But technically it never did. It just wouldn't work unless we took the casing off and put a fan on it. We played it like that for a good while. Never got a red ring or red anything, though.