Hello! I have a early 2011 Macbook Pro and lately i started to notice that when my computer reaches high temperature (above 70ºc) i can see a dark shadow in a cone shape right above the CPU and GPU fans. I can only see them IF my screen image is black (in this case there is a difference between the black of the rest of the screen and the black of the "shadow") or a dark almost black gray. The last scenario is the one that the shadows are most visible. If the screen image/color is lighter its perfectly normal. For example in the Solid Colours available on the wallpaper preferences, i can't see the shadows with any of them, it must be darker then the darkest gray there. The higher the temperature the most visible the shadow is. If i'm doing some very intensive stuff and the computer is like 1 hour near 90ºc, then the shadows are easy to see on a dark background. As the temperature drops, the shadow tend to disappear. My first thought was that this could be the leds right above the heat exits getting dimm due to the hight temperature (they get brighter on colder situations), but i would like to know if this is a normal behaviour. Should i get worried that somewhere in the near future i will be short of 2 leds?! Or is this normal? Anyway, here are 2 pics of the situation. The first one is with 80'ish ºc the second one is with 30'ish ºc. Its a lot more visible in the naked eye. The camera didn't make it justice. But even so, its perfectly visible. So, should i be worried?