That's like saying because one can't prove how the pyramids were built, we can not rule out the idea that time-traveling space aliens were involved in their creation. One has no relation to the other.

I can tell you that the temperature needed to damage plastic at this level would also damage any LCD display on the market. The CPU has a thin top plate, a plastic frame, a keyboard, a metal shell back, sliders, another later of plastic, the LCD, and about 1mm of air between it and this outer plastic layer. Any "thermical effects" the CPU could generate that would even reach the outer layer of the device would by necessity damage at least some of those components before the heat got intense enough to cause this type of damage.

You've already been proven wrong about "perpetual high" frequency use, So tell me: If you don't even understand what overclocking does, or how it works, why are you so convinced that it could cause this?

It is far more likely to be the result of exposure to skin oils and/or UV/sunlight, both of which are known to break down plastic in this exact way. This is called crazing, and it's primary cause are UV exposure and access to oils and salt. Many salt-water fish enthusiasts (who bough acrylic vs glass tanks) and drivers of convertible cars have know of these issues for decades.

And I did mention that in the post you reference, so yes, I have a much better explanation of what this probably is, with photographic evidence (link above) to back it up. Where's your proof that this is a "thermical effects"?

So please, stop spreading FUD about overclocking when you are clearly clueless about how not only how it works, but if/how it's capable of damaging devices.