computer wrote:

when the motherboard starts up , there is always warning sound, and ask to
shutdown or not.

actually the cpu fan is turning , but the BIOS display that it is not
turning.

I have turned off the warning of the cpy fan, it cpu fan in bios said it is
0 rpm.

any help is appreicated.

tia



Maybe the RPM sensor (built into the fan) is not working.
Try replacing with the correct fan - three wire - red - white - black.
Otherwise it's likely a problem with the motherboard's RPM sensor.
Shouldn't be a problem unless the fan fails... Then your CPU may go up
in smoke in less than a second - depending on CPU type, heat sink size,
other protection/fans, etc.