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Add a fan and rig won't POST

Last response: in Overclocking
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July 3, 2011 4:43:42 AM

I have one of the R4 Cooler Master 120mm case fans, that have 4pins.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I tried using something similar to this (http://www.newegg.com/Product/Product.aspx?Item=N82E168...) to run it off my power supply, but it won't work. To get these to fit my 4pin fans, i had to cut off the sides that were blocking it.
Anyway, the 2pins are connected to the black and yellow wires of my fan.

I press the power button and they spin for the slightest amount of time(0.1s?) before everything stops and nothing happens. I press the power button again and nothing happens at all. If I switch off the power and turn it on again, and then press the power button, the same thing happens.

If I remove this fan to my power supply, the computer can power on normally.

I'm using a Corsair HX850W Power Supply. I use that molex connector I hooked up to the fan and plug it into the power supply's included molex wire, and then i connect that molex wire to the power supply at one of the black 6-pins ones.

More about : add fan rig post

a c 89 ) Power supply
a b K Overclocking
July 3, 2011 5:15:46 PM

If this is a Dell computer, the fan wiring is different, and standard fans from Newegg will not work unless the pins are modified. See: http://en.wikipedia.org/wiki/Computer_fan

For Dell computers get fans from 'Skyline Graphics' - when you call/contact them tell them you want a fan for a Dell computer (no wiring changes required)

Address: 6126.Belgrade.Avenue
Dallas TX 75227
Phone: 214.388.7922
E-Mail: enilyks1@msn.com
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July 4, 2011 1:35:50 AM

This is not a Dell machine, but thank you anyway.
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a b ) Power supply
a b K Overclocking
July 4, 2011 9:20:14 AM

Shorting the PSU through the fan (which I think is what you did), means the PSU won't power on. Remember, the black wires are negative, or earthed. The red wire is the +5V wire and the yellow wire is the +12V wire. The fan's wires need to be connected to the correct wires, or they won't work. Also, "cutting" on the connector probably means it wasn't meant to go where you put it in the first place. I'm sticking with a short, it's a classic symptom (PSU powers up for a millisecond and then shut down) and an easy mistake to make. Rather remove the fan before you damage something you don't want to be damaged... :) 
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a c 121 ) Power supply
a b K Overclocking
July 4, 2011 5:50:28 PM

That's a PWM fan. It should not be connected directly to the PSU, but to a PWM header on the mobo. You're probably shorting your PSU through the PWM circuit, causing it to quickly shut off, but you will probably quickly kill the fan, if you haven't already.
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a b ) Power supply
a b K Overclocking
July 5, 2011 5:53:53 AM

Onus said:
That's a PWM fan. It should not be connected directly to the PSU, but to a PWM header on the mobo. You're probably shorting your PSU through the PWM circuit, causing it to quickly shut off, but you will probably quickly kill the fan, if you haven't already.


I bought an exact fan like this about 6 months ago, and I got a standard 4-pin Molex connector-adapter thing inside the packet with the fan. Mine is running at full speed from the PSU from my spare Molex connectors, so I don't know... :/ 
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a c 121 ) Power supply
a b K Overclocking
July 5, 2011 6:10:14 AM

An adapter that provides power to the correct pins may work, but it sounds like the OP's jury-rigged adapter did not do that.
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July 5, 2011 2:43:10 PM

gee..so can anyone link me the correct molex wires i need?

i want to daisychain 3 of these fans to run off the psu.
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a b ) Power supply
a b K Overclocking
July 6, 2011 5:46:01 AM

I'm going to have to apologize to you for this, but I was mistaken. The fan you linked is wrongly named on Newegg, that's definitely not a case fan. The one you linked is a cooler fan, correctly named here: http://www.prophecy.co.za/coolermaster-blade-master-coo...!tab2

You could've asked Newegg to replace the fan for you for a correct case fan, but since you cut the connector I don't think they'll accept it. If you haven't already cut or even bought the other fans, don't, and contact Newegg for replacements. Case fans will have a 3-pin connector, not a 4-pin connector. I realized this when I checked up my fans, and noticed their connectors. The correct fans for you to get will be something like these: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I do apologize for the misleading, it's entirely my fault. I'm contacting Newegg as we speak to inform them of their mistake.
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July 6, 2011 7:35:11 AM

Eh? But on newegg it says Recommended for Hyper 212 Plus, V8, V10, Hyper N 620, HAF 932, HAF 922 applications

the HAF 932 and HAF 922 are cases...

and in the feedback page there are people using it as case fans..
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a b ) Power supply
a b K Overclocking
July 6, 2011 12:00:28 PM

It can be used as a case fan as the motherboard often has more than one plug for a CPU fan (mine has two, one for CPU fan and the other reads as "case fan" in the BIOS). If you want to use a few of them for case fans however, the plugs on the motherboard are insufficient. My Hyper 212+ cooler has the stock fan, 120mm in the "CPU Fan" plug on the mobo, and the other fan on the cooler (push-pull configuration, Cooler Master R4 blue LED case fan) is plugged into the "Case Fan" (at least I think it's "Case Fan", can be named something else like "System Fan" plug on my motherboard.

What it boils down to is this: The fan you have has a 4-pin connector. I was unable to find a 4-pin fan plug converter to 4-pin Molex, so I did checking. I have the 3-pin fan plugs on my case fans, with the CPU fan running 4-pin. I'm standing by my idea that Newegg is incorrect.

Finally: Read the feedback posts some more. Few are just stupid with no real info, but some of them read, and I quote, "4pin connector for mobo to control fan speed", "A good choice if your system supports PWM fans", "The motherboard fan headers all support PWM fans", "Bought this to match the Cooler Master Hyper 212 Plus", "Used it for push/pull on my CM Hyper 212+ because it looks exactly like the included fan".

:/ 
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a c 243 ) Power supply
a b K Overclocking
July 6, 2011 12:05:20 PM

fakie said:
Eh? But on newegg it says Recommended for Hyper 212 Plus, V8, V10, Hyper N 620, HAF 932, HAF 922 applications

the HAF 932 and HAF 922 are cases...

and in the feedback page there are people using it as case fans..

That's fine.
Just because Toxxyc's MB doesn't have 4 pin cha_fan headers doesn't mean a 4 pin fan isn't a case fan.
You shouldn't have had to cut anything in order to hook up the fans, can you provide a picture ?
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a c 121 ) Power supply
a b K Overclocking
July 6, 2011 1:08:44 PM

Paraphrasing, these are 4-pin PWM fans. CPU cooler (HSF) fans are generally of that type, and you'll see that the CPU fan header on the mobo has 4 pins. SOME, but not all, mobos have additional PWM fan headers; mine, for example, I believe has four of them. In that situation, you can use them as case fans. Otherwise, most mobos use three-pin headers for case fans, and such fans typically come with an adapter that lets you plug a molex from the PSU into them instead.
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July 6, 2011 1:46:40 PM

This is the fan's 4pin female http://imageshack.us/photo/my-images/217/img00085201107...

This is the molex one i cut to fit http://imageshack.us/photo/my-images/217/img00089201107...
and it's connected to my power supply's wire

Another photo of it http://imageshack.us/photo/my-images/21/img000902011070...
and another one http://imageshack.us/photo/my-images/812/img00091201107...

If you look closely, i cut off the side and there's only 2 pins for that.

This is a photo of me hooking the fan to the 2pin molex thingy
http://imageshack.us/photo/my-images/121/img00092201107...

How I hook it up to the power supply http://imageshack.us/photo/my-images/163/img00093201107...
In addition to that fan, I want to chain another 2 off the power supply, although regardless of the number of additional fans, be it 1 or 3, it still won't post.

Finally, this is a picture http://imageshack.us/photo/my-images/51/sorryh.jpg/
to apologize for the lousy quality and low resolution of the photos because I took them with my blackberry
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a c 243 ) Power supply
a b K Overclocking
July 6, 2011 2:10:34 PM

fakie said:


This is the molex one i cut to fit http://imageshack.us/photo/my-images/217/img00089201107...
and it's connected to my power supply's wire

How I hook it up to the power supply http://imageshack.us/photo/my-images/163/img00093201107...

You're taking a molex to pcie adapter and plugging it in to your power supply in order to power molex fans ? :o 
Did you determine the pinout on the output port of the psu and repin the adapter connector accordingly ?
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July 6, 2011 4:49:13 PM

FUUUUUUUUUUUUUUUUUUUUUUUU i just realized i've been looking at my old bag of HX650W cables......now i remember never having opened the hx850w cable bag...

gotta start hunting for dem cable bag

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a c 243 ) Power supply
a b K Overclocking
July 8, 2011 11:09:17 AM

I would use a molex strand and the fan adapter cables ( the 2 in the center of the photo )
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July 8, 2011 3:23:58 PM

haha im confused. it's one of the left ones and the 2 middle ones? im supposed to hook the two middle ones to the fans or? do i still use my old fan adapters? the one i cut the sides away?

fakie....y u no basic computer knowledge=(
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July 8, 2011 3:24:10 PM

haha im confused. it's one of the left ones and the 2 middle ones? im supposed to hook the two middle ones to the fans or? do i still use my old fan adapters? the one i cut the sides away?

fakie....y u no basic computer knowledge=(
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a c 89 ) Power supply
a b K Overclocking
July 8, 2011 3:28:23 PM

fakie said:
haha im confused. it's one of the left ones and the 2 middle ones? im supposed to hook the two middle ones to the fans or? do i still use my old fan adapters? the one i cut the sides away?

fakie....y u no basic computer knowledge=(

It's great that you have a good sense of humor! You are well on your way to success!

Keep going buddy! :) 
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a c 243 ) Power supply
a b K Overclocking
July 8, 2011 3:42:50 PM

fakie said:
haha im confused. it's one of the left ones and the 2 middle ones? im supposed to hook the two middle ones to the fans or? do i still use my old fan adapters? the one i cut the sides away?

Sorry, it was early.
A molex strand ( one of the left ones ) and the adapter you cut.
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