You have tested the fan and it works ok, your PSU could potentially be 7 years old and therefore well out of warranty so looks to be the more likely culprit imo, keep in mind that in your previous thread that I mentioned the long term problems that overheating causes.Can't imagine what we've done so far would affect the fans but something's happened. And to put the icing on top the cake I now see one of the three base fans in the case isn't moving also.
I don't know if it's fan problems or power supply problems or something else, but it's not in a good state at present.
The MBs thermal sensor relies on the CPU cooling fan to be connected to the correct CPU fan header on the MB else it will detect the cooling fan as having failed and throw up an error and should shut down to prevent the CPU from frying.Just a thought. Can one avoid the CPU_FAN motherboard plug altogether by installing some kind of fan controller ? In which case how would it be powered ?
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