I called boaphile and the guy ran me through some "diagnostic" type tests. He decided that it was the heat tape. The rack is still under waranty so they are going to send me replacement heat tape and then talk me through the installation. In the mean-time, I have all but two of the snakes in my room-mates rack. The other two I have moved to a sterilite container with a heating pad underneath. So, I hope everything will be ok until the new tape comes. Thanks for the replies.