Troubleshoot Fan Error on startup

Continuing the trend of being “IT Support” guy in the family from yesterday, my uncle asked me to look at his computer that has been giving some “Fan Error” message upon start up, “Press F1 to resume”.

I quickly took a look, and he was right. Now, there are only few possibilities there: Fan not running (which is dangerous), Fan is running but sensor not plugged in (not too bad), Fan is running and sensor is plugged in, but somehow not detected (false alarm).

I opened up the casing, saw the fan looks alright. I plugged out and plugged the CPU Fan cable back in, and voila, suddenly the fan speed is detected, and no more “Fan Error” message upon every start up.

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