Error: CPU Fan is not working

[Kantastic]

if the fan was the problem than that will fix it. But it would be better and faster to plug the fan into a 12V header just to see if its really the prob.

Sadly I don't have a molex adapter to do so.

 

[Velvet Wafer]

splice some cables to get some copper wire... black and red should be 7v and black and yellow should be 12v

 

[Geofrancis]

plug the 4 pin cpu fan onto a 3 pin fan motherboard header and put another smaller higher rpm fan onto the cpu header so that the motherboard gets the higher speed rpm signal.

 

[Kantastic]

plug the 4 pin cpu fan onto a 3 pin fan motherboard header and put another smaller higher rpm fan onto the cpu header so that the motherboard gets the higher speed rpm signal.

But if my CPU gets hot what's going to happen? The rear fan is going to be exhausting more air, so what about the actual CPU fan?

splice some cables to get some copper wire... black and red should be 7v and black and yellow should be 12v

I don't feel safe doing that. ^_^

 

[erocker]

So what are your options then? Can't do this, don't want to do that...

Go buy a 3pin mobo to molex adapter or just get a new fan.

Your signature violates the rules by the way. Remove it please.

 

[Kantastic]

So what are your options then? Can't do this, don't want to do that...

Go buy a 3pin mobo to molex adapter or just get a new fan.

Your signature violates the rules by the way. Remove it please.

I take this as a message to let this thread die.

I'll just order a 3 pin fan if I'm left with no other options.

Case closed, thread can be as well.

 

[erocker]

Well, unless anyone has any other ideas?

 

[douglatins]

im thinking about the cpu fan pin, might be broken, can you disable CPU fan tracking? might work

 

[Kantastic]

Unfortunately no. That option is grayed out in the BIOS. When I reset the power supply I can hear and feel the CPU fan blasting out air so I don't think anything is actually broken. Just don't know why it refuses to go above 480 RPM when it's up and running.

If I purchase a 3pin fan and connect it to a 3pin header, does that mean it will spin at 100% all the time?

Last question I need answered before I order the Vantec 92mm off the Egg.

http://www.newegg.com/Product/Product.aspx?Item=N82E16811999617

 

[Geofrancis]

yes your fan will run at 100% if connected to a 3 pin fan header and if you put a 4 pin fan onto a 3 pin header it will run at 100% as its not getting the pwm signal.

 

[Velvet Wafer]

the same that will happen if you hook it directly to the 12v rail...

 

[dominator2]

Sounds to me like you have a bad fan which is drawing two many amps. I would recommend that you buy a another inexpensive CPU heatsink combo. Most fans for heat sinks run 1200-3600rpm depending on the heatsink. If you have another 3 pin fan header on the motherboard put your old HSF on your cpu and plug it in so your computer will boot. Plug the heatsink/fan into another 3 pin header and see if it still turns slow. Don't try this without using your old HSF to cool your CPU or you will probably fry your CPU. If it still runs slow then it is the fan. I doubt if its the motherboard voltage from the cpu fan header. If that was the case it would cause your old HSF to be slow also. Check Newegg for a deal on a new CPU cooler

 

[Kantastic]

I just got this HSF off a fellow forumer for $20. It's a good cooler and cools beyond my needs. I'm probably going to buy a new 3pin fan that has a built in sensor like the Vantec 92mm on Newegg. What I don't get is why it only works when I reset the power supply.

 

[chuck216]

I just got this HSF off a fellow forumer for $20. It's a good cooler and cools beyond my needs. I'm probably going to buy a new 3pin fan that has a built in sensor like the Vantec 92mm on Newegg. What I don't get is why it only works when I reset the power supply.

NO don't get one with a built in sensor.. that's what's causing the problem in the first place. Temp sensor fans don't work right on tower type coolers because they're too far from the CPU to detect the CPU's temperature accurately. Just get a standard 92mm fan with a 3 pin motherboard header. preferably the highest CFM you can get.

I'd suggest something like this http://www.newegg.com/Product/Product.aspx?Item=N82E16835705011

 

[Kantastic]

That thing is LOUD though.

I was looking @ this http://www.newegg.com/Product/Product.aspx?Item=N82E16811999617 since it's got a sensor. Is that bad? =x

If I get the Rexus that means it will run at 100% all the time right? =x

 

[chuck216]

That thing is LOUD though.

I was looking @ this http://www.newegg.com/Product/Product.aspx?Item=N82E16811999617 since it's got a sensor. Is that bad? =x

If I get the Rexus that means it will run at 100% all the time right? =x

Repeat after me: Fans with built in temperature sensors are BAD when used on Tower coolers, because they detect the case temperature and not the CPU temperature.

Having the fan run at 100% all the time is what you want. Especially on a CPU fan and that thing is quiet compared to what I use. Imagine what a 160 cfm 120mm x 38mm thick fan spinning at 3400 rpm sounds like. But the whole idea is cooling the CPU as much and as quickly as possible.

If you must have a variable speed fan get one that has a 4 pin MB header and is controlled by the motherboard BIOS based on actual CPU temperature.

 

[Kantastic]

I only have a 3 pin header on my motherboard so I can't take advantage of PWM. I'm just afraid that it'll be loud since my computer is on almost 24/7 in my room like 3 feet away. Guess I'll go with that Rexus or something similar.

Right now the fan spinning at 480 RPM is keeping my CPU under 50C on max load, but it's just the quirk with not being able to boot up probably that's urging me to buy a new fan. I don't really need all that power, I mean it'd be great if it was quiet, but since I don't need it I might go with a slower fan that creates less noise.

 

[95Viper]

Scroll down on this web page and read the section "Fix for PWM Fans Not Running at Full Speed on Legacy 3-pin Motherboards" ,click this link:http://www.frostytech.com/articleview.cfm?articleID=883

Hope it helps.

 

[Kenshai]

Kan I have a fan for you if you want it.

Here

Came with the battle axe cooler that I got for $3 AR
For shipping it is yours.

 

[Geofrancis]

the problem is not the fan running too slow its the motherboard cannot detect the fan running as slow as that so it thinks its faulty.

 

[chuck216]

the problem is not the fan running too slow its the motherboard cannot detect the fan running as slow as that so it thinks its faulty.

Wrong. His fan is running way too slow. the speed of a 92mm cpu fan should be around 2500 to 3000 rpm. He's getting under 500 rpm, his cpu is basically being passively cooled. Which is cudos to the heatsink itself.

Oh and if you think 50c under load is OK it's not, not with that cpu. My last cpu was the 5600 brisbane and from experience I'll tell you it should get around 25c at idle and no more than 40c under load. It's designed to run cool.

 

[Geofrancis]

Wrong. His fan is running way too slow. the speed of a 92mm cpu fan should be around 2500 to 3000 rpm. He's getting under 500 rpm, his cpu is basically being passively cooled. Which is cudos to the heatsink itself.

Oh and if you think 50c under load is OK it's not, not with that cpu. My last cpu was the 5600 brisbane and from experience I'll tell you it should get around 25c at idle and no more than 40c under load. It's designed to run cool.

the fan is being controlled by the motherboard that is the whole point in a pwm fan so it can run at very low rpm's without stalling and 50c is fine for full load the cpu is rated to 70c.

if the cpu heated up more the fan speed would increase with it to stop it from heating up more untill it hit full speed when the cpu gets to about 60-65c

and the fan should not be running at 2000+ rpm all the time it only goes to those speeds when its hooked into 12v directly or when the motherboard tells it to go full speed all other times will will run only as fast as it has to.

 

[Kenshai]

Wrong. His fan is running way too slow. the speed of a 92mm cpu fan should be around 2500 to 3000 rpm. He's getting under 500 rpm, his cpu is basically being passively cooled. Which is cudos to the heatsink itself.

Oh and if you think 50c under load is OK it's not, not with that cpu. My last cpu was the 5600 brisbane and from experience I'll tell you it should get around 25c at idle and no more than 40c under load. It's designed to run cool.

Actually the brisbane cores get quite crispy, my brother is running one. Stock cooler with stock speeds ran ~60 under load, after tossing the Zalman CNPS9500 on it, it still pulls mid to high 40s stock. That cooler should be plenty for that CPU.

the fan is being controlled by the motherboard that is the whole point in a pwm fan so it can run at very low rpm's without stalling and 50c is fine for full load the cpu is rated to 70c.

if the cpu heated up more the fan speed would increase with it to stop it from heating up more untill it hit full speed when the cpu gets to about 60-65c

and the fan should not be running at 2000+ rpm all the time it only goes to those speeds when its hooked into 12v directly or when the motherboard tells it to go full speed all other times will will run only as fast as it has to.

You can usually change the point at which the fan will start to spin up faster, but he can't adjust it. I'm willing to bet his motherboard doesn't know what to do with the fan, for some strange reason.

Kan what happens when you plug the 4 pin fan into a 3 pin slot?

 

[Kantastic]

My motherboard doesn't have PWM support. It IS plugged into a 3 pin slot.

 

[mc-dexter]

I've only skimmed through this topic and haven't seen this mentioned... have you tried a BIOS update?