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I have a serious problem ( i think )

My case has 4 fans. 2 on top 1 on front and 1 on back.

Each of these have 3 pin connections.

I'm confused because theres CHA_FAN 3 / CHA_FAN 2 and PWR_FAN 1 , each of them having 3 pin connections.

That leaves the last fan , theres a CHA_FAN 1 but its a 4 pin.

There are no other fan connections on my mobo.

Also each of the fans have some sort of flat head 4 pin thing , which I couldn't figure out where they plug into.

My Motherboard


EDIT: Can I plug one of em in CPU_FAN 2? Will it work?
"Can I plug one of em in CPU_FAN 2? Will it work?"
Yes.

You can also plug a 3-pin fan header into a 4-pin connection on the board. Just align that little notch on the motherboard connector and on the fan header.

"Also each of the fans have some sort of flat head 4 pin thing , which I couldn't figure out where they plug into."
Those are an alternative source of power, that can be plugged into the power supply.

VERY IMPORTANT: Plug either the 3-pin header into the motherboard or the 4-pin to the power supply. NOT BOTH.