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computer turns off when i plug in fan

Billsk8
By Billsk8
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so as the title says, i have a rear fan and a cpu cooler fan plugged in my MB, but my front 2 fans are only plugged in with molex and when i try to plug in the connector it shuts down my computer.

Id like to get info on the fans but cant.

 

I have tried diferent connectors on the motherboard and it seem that when i get to 3 fans plugged in, it happens.

 

Could it be a power issue? fans dont take to much power so I dont see that being the issue. I have a 750w psu with just 1 gpu, 2ssd and 1 hdd.

 

any ideas?

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Posted

Why don't you turn your pc off first and then plug them in?

Case: Corsair 4000D Airflow; Motherboard: MSI ZZ490 Gaming Edge; CPU: i7 10700K @ 5.1GHz; Cooler: Noctua NHD15S Chromax; RAM: Corsair LPX DDR4 32GB 3200MHz; Graphics Card: Asus RTX 3080 TUF; Power: EVGA SuperNova 750G2; Storage: 2 x Seagate Barracuda 1TB; Crucial M500 240GB & MX100 512GB; Keyboard: Logitech G710+; Mouse: Logitech G502; Headphones / Amp: HiFiMan Sundara / Mayflower Objective 2; Monitor: Asus VG27AQ

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Why don't you turn your pc off first and then plug them in?

oh yea forgot to mention that, I've tried. My PC doesnt turn on afterwards

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Posted

sounds like a psu issue have you tried the fan instead of the others could be that the fans causing a short 

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Posted

so as the title says, i have a rear fan and a cpu cooler fan plugged in my MB, but my front 2 fans are only plugged in with molex and when i try to plug in the connector it shuts down my computer.

Id like to get info on the fans but cant.

 

Then there's likely a short circuit occurring in the fan itself, the fan's connector, or somewhere in between. Possibly bad soldering of the wires onto the fan PCB

Desktop: Intel Core i5 2380P (2400 w/o iGPU), MSI H61, 8GB RAM, 256GB SP610, 500GB WD Blue, HIS R9 280, Antec TruePower Classic 550W, Inwin MANA 134, QNIX QX2710, CM QuickFire Rapid, Logitech G402

 

Laptop: Toshiba Satellite L40D, AMD A6-6310, 6GB RAM, 500GB HDD, Radeon R4 Graphics, 14" 1366x768

 

 

Phone: iPhone 6 Space Gray 64GB, T-Mobile $60/mo 3GB plan

 

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sounds like a psu issue have you tried the fan instead of the others could be that the fans causing a short 

yea I pretty much tried every fan in every connector possible, everytime a third one is plugged in it wont work

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  • 9 years later...
Posted

Hey so I know this post is extremely old and the original writer of it won’t see this but I had the exact same issue and I figured out the solution.

 

Sometimes with molex power connectors for fans they have a 4 pin motherboard header at the end DO NOT PLUG IN THE 4 PIN HEADER it will short your motherboard and if it doesn’t have good short protection you could fry it.

 

Find the 3 pin header from your fans and if they’re daisy chained you only have to plug in one, but make sure to plug in the 3 pin header and not the 4 pin header and your fans should work as intended (without 3 pin headers you can always plug in a 3 pin female into a 4 pin male if you plug the 3 female pins into the 3 left most pins of the 4 pin male).

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