I've monitored the heat and it always seems to be fine. In fact, I bought a top-of-the-line heat sink and fan after this problem started in hopes that it might fix the problem.
As for the computer being dirty, its the same at home, so I doubt that is the case.
The socket is worth a try, I guess. I've changed power cords with no success, but can't remember changing the sockets on purpose.
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