This is a strange one. I doubt it is a short on the card. I can't think of any shorts that could be "assisted" by thermal expansion, and I've never seen a case of it (granted some chips don't behave well below zero). Could you be more specific about your setup so we can have an idea as to how everything is mounted; what you are running in your system (PSU, MB, CPU, RAM, etc) would also help in the diagnosis. In all probability it is the PSU. The addition of the pump probably hurt the 12v rail which would feed into your video card if your are running an AGP system.
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