the character select screen does indeed heat up much more than the rest, using catalyst OD + performance monitor you can see as titanium suggested that gpu load is pegged at 100% and cpu load is very low. however, any well designed cooling system/card should have been designed to cope with a full 100% theoretical load (eg every transistor switching at full speed). recent issues on this line are the "furmark" bug in some ati cards where the power regulation was designed for a typical load, rather than the worst case and since furmark was much more like worst case the cards would go to their safety shutdown. it seems that in your case your graphics card cooler is not designed to cope with this worst case, or your computer case cant cope with the thermal load. check for dust bunnies!