1) Several appliance machines were in a cabinet with water-cooling doors attached. The doors restrict the airflow from the front of the cabinet to the back to the point where there isn't sufficient airflow to cart away the heat from the CPUs. The engineer responsible for those particular systems played show-and-tell with the melted plastic pins that formerly held the motherboard in-place for a month after the machines crashed.

2) An 8-year old rackmount machine had a power supply fail spectacularly and light the entire server on fire. Fire suppression was triggered in response. Several other adjacent machines were damaged but the fire stayed relatively contained to the one cabinet.