HT203171 Why does my laptop overheat and then the fan goes absolutely beserk!!!

Well basically after about half an hour of use the laptop starts to make a luder fan noise.
After 10 minutes of this the fan goes beserk - I mean beserk and it's quite scarry. Then the entire operating system fails and the system restarts. I tried resetting the PMU but it won't reset properly. I need some other way of fixing it.

Hello:
You need to take the computer in for diagnosis.  There is a hardware issue, but no one can diagnose that on-line.
Barry

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