It sounds like you have a number of issues with your husbandry.
First and foremost is cage heating. Under tank heaters must be regulated by a thermostat. Without a thermostat to control them they can easily get up to 130 F+
Check out this thread on cage heating. It covers all of the basic products available as well as recommends trusted products.
http://ball-pythons.net/forums/showt...t-Thermometers
Second You really shouldn't keep snake together in the same cage unless you really know what you are doing. The things that made you think that the snakes liked each other are actually signs of them trying to dominate each other and compete for the best hides etc. This could also very easily be a big part of why you have had trouble getting the snake to eat.
Here is a thread on how I set up glass tanks for ball pythons. Try to get yours as close to this as possible:
http://ball-pythons.net/forums/showt...With-Pictures!
Finally just to make sure you have all of the care requirements correct check out this thread on general care:
http://ball-pythons.net/forums/showt...ius)-Caresheet
As for the snake that died. Do you happen to have any pictures of the snake(s), the snake(s) cage(s) etc? What you are describing sounds very strange.
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