This one never had any outward signs. It never even seemed especially hot when in use. Any other day of the year, we’d have lost the house, at the very least. It was 3 AM, and we were doing an all-night Lord of the Rings marathon.Glad it didn't explode when in use. Sometimes my department gets laptops back and we just sake our heads at how so many people miss a really bad situation. Batteries would swell enough to crack open the case but the techs don't hear about it until 2 months later when the user "has time." We did have one set a desk on fire in the office from what other techs tell me.