fans spinning when machine switched off | Linus Tech Tips | Page 1

true sail Mar 28, 2023, 8:40 PM

#

Posting here again cause no one could help me last time I tried.

I rebuilt my rig into a Corsair 4000 series case. I have a Gigabyte B450-A pro, a GTX1660Ti and a 2700X.

For some reason, any time I plug in any fans, including the CPU fan, they all run on full blast as soon as the PSU is powered on. They run normallly if the machine is on, but when it’s off, the CPU light on the motherboard lights up, and the fans run full blast

real heath Mar 28, 2023, 8:55 PM

#

Do they run full blast on startup, but when windows is loaded, they are fine?

true sail Mar 28, 2023, 9:10 PM

#

No, they run on full blast before start up if the PSU is even powered on, they run full blast

real heath Mar 28, 2023, 9:15 PM

#

Are they plugged straight into the PSU?

#

Or are they wired only through the motherboard

true sail Mar 28, 2023, 10:16 PM

#

wired through the motherboard

lime tusk Mar 29, 2023, 2:54 PM

#

real heath Are they plugged straight into the PSU?

How would they be plugged straight into the psu?

real heath Mar 29, 2023, 3:05 PM

#

lime tusk How would they be plugged straight into the psu?

OP may be using an adapter.

#

Due to misunderstanding how fans work. Seen it before.

lime tusk Mar 29, 2023, 3:13 PM

#

Like sata power for the fans into psu

#

That would make them spin at 100

#fans spinning when machine switched off