TS1433 The fan of my 2013 iMac running 10.9.5 keeps running on full speed even if there is no programs running. SMC reset is not working

The fan of my 2013 iMac running 10.9.5 keeps running on full speed even if there is no programs running.
I've tried the SMC reset, but around 5 minutes after restarting the computer the fan picked up speed again.
When trying to shut down the mac normally and turning it back on - the fan starts directly.
Thanks already for any tipps or tricks to resolve this problem!
Additional Information:
2.7GHz Intel Core i5
8GB 1600MHz DDR3

Hi @krod619 ,
Thank you for visiting the HP Support Forums and Welcome. I have about your HP Pavilion dm4 3099se Notebook and overheating error and shutting down. I would reset the BIOS with this document selecting the reloading the BIOS default settings. This will reset the fan.
Hope this helps.
Thanks.
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TS1433 The fan of my 2013 iMac running 10.9.5 keeps running on full speed even if there is no programs running. SMC reset is not working

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