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Original post by: BurnieG ,

Text:

The fan running at full speed and PC won't respond when trying to power up, that sounds to me like the SMC(System Management Controller) is causing you problems. You could try resetting the SMC.  Although it may be damaged which resetting won't help but it's worth a shot.   Here are a few links that explains the SMC's functions and how to reset the SMC:

https://support.apple.com/en-us/HT201295

http://www.makeuseof.com/tag/reset-macs-smc-pram/

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