I am wholly confused. You say you have an "amd" then "no cooler" and then an "intel core i5...". So I have no idea what CPU you have but that doesn't matter if you are not using some sort of heat sink on the CPU. By saying "cooler", I don't mean water... I mean anything... assuming you have a air/fan based heat sink.
If you do have a heat sink, you may want to remove it, clean it and the CPU lid and reapply thermal paste. Otherwise, I am not sure what you actually are talking about. Sorry.