To be clear: is the fan not moving much or not moving at all?
If not at all: are the other fans working? If so, try connecting the CPU fan to one of the fan headers you know is working.
EDIT: If it isn't moving much, that's fine. The fan is PWM, which means that it will vary its RPM in accordance with CPU temperature.
If not at all: are the other fans working? If so, try connecting the CPU fan to one of the fan headers you know is working.
EDIT: If it isn't moving much, that's fine. The fan is PWM, which means that it will vary its RPM in accordance with CPU temperature.
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