Need help with CPU fan issue

[xany01]

I am building a new pc and have a b450 rog strix motherboard with a Ryzen R5 CPU 2600x with the stock CPU fan and a MSI core frozor L as well as Corsair vengeance LPX ddr4 ram 3000 (24000) and a corsair HX 1000 power supply 80+ platinum . I tried to run a test to see if everything was working before I put the motherboard with everything on it in my case. So I plugged everything in to my power supply and turned it on. The motherboard light turns on but the CPU fan never even moves and the CPU fan led never turns on either. This is the case for both CPU fans. So my question is, do I have something plugged in wrong or am I missing something or is my CPU or something else fried?

https://gyazo.com/27f33f23d3fb0a38be277466731623cc

https://gyazo.com/1e308295fca55d768f42bf6a94665c99

https://gyazo.com/9af77b3237bdc81d4110ad4c2de08729

https://gyazo.com/58e1d1c968c189669da1951760f2ce9b

https://gyazo.com/8e1b0a4fdaac14dc79a64a449fb75264

 

[Darkbreeze]

What fan header are you plugging it into? Usually there are two CPU fan headers, CPU_FAN and CPU_OPT. You need to be plugged into CPU_FAN.

Make sure you have the notch in the connector lined up with the key on the four pin header so that the connector is oriented the correct direction.

Did you buy this board new or used? You might try connecting the CPU cooler fan to one of the case fan headers and then power on the system just to see if the fan does indeed spin up.

 

[xany01]

What fan header are you plugging it into? Usually there are two CPU fan headers, CPU_FAN and CPU_OPT. You need to be plugged into CPU_FAN.

Make sure you have the notch in the connector lined up with the key on the four pin header so that the connector is oriented the correct direction.

Did you buy this board new or used? You might try connecting the CPU cooler fan to one of the case fan headers and then power on the system just to see if the fan does indeed spin up.

I tried plugging the CPU cooler into a bunch of different headers including CPU fan, none worked. I have the notch lined up properly and I got the board new, everything in my build is new. I also added some pictures if you wanna look.

 

[Darkbreeze]

So, since this is on the bench, so to speak, I'm assuming you don't have any case fans connected to the motherboard in order to see if they work?

Does your motherboard have a Q code display, or do you have a system speaker attached to the motherboard for error code beeps? If not, that might be the first thing you want to do is get one.

https://www.amazon.com/PC-Internal-Mini-Onboard-Speaker/dp/B002W4M0DW


Honestly, I think you ought to pull the CPU back out and check for bent pins on the CPU. Usually when the CPU fan header, and other headers, won't work, it's because the CPU was incorrectly installed and something is shorted out in the CPU socket.

 

[xany01]

So, since this is on the bench, so to speak, I'm assuming you don't have any case fans connected to the motherboard in order to see if they work?

Does your motherboard have a Q code display, or do you have a system speaker attached to the motherboard for error code beeps? If not, that might be the first thing you want to do is get one.

https://www.amazon.com/PC-Internal-Mini-Onboard-Speaker/dp/B002W4M0DW


Honestly, I think you ought to pull the CPU back out and check for bent pins on the CPU. Usually when the CPU fan header, and other headers, won't work, it's because the CPU was incorrectly installed and something is shorted out in the CPU socket.

I’m going to bed now but I have all day to work on it tomorrow so I’ll keep you posted. Thank you very much for the help, I hope the issue isn’t serious. Returns are a drag, let me know if you think of anything else in the meantime. Thanks again.

 

[Darkbreeze]

It almost HAS to be either a bad CPU installation resulting in bent pins or a bad motherboard. It's very doubtful that two different CPU coolers wouldn't spin up. Again, I'd take one of the fans for your case and connect it to the CPU fan header, power on the system and see if it spins up. If it does, then both of your CPU coolers are bad OR they have had the fans replaced with three pin models that won't work on a PWM header.

Other than that, it's got to be the CPU or motherboard. It might be worth trying to reset the bios though just in case somehow the CPU fan settings in the bios were turned off.

Power off the unit, switch the PSU off and unplug the PSU cord from either the wall or the power supply.

Remove the motherboard CMOS battery for five minutes. During that five minutes, press the power button on the case for 30 seconds. After the five minutes is up, reinstall the CMOS battery making sure to insert it with the correct side up just as it came out.

Now, plug the power supply cable back in, switch the PSU back on and power up the system. It should display the POST screen and the options to enter CMOS/BIOS setup. Enter the bios setup program and reconfigure the boot settings for either the Windows boot manager or for legacy systems, the drive your OS is installed on if necessary.

Save settings and exit. If the system will POST and boot then you can move forward from there including going back into the bios and configuring any other custom settings you may need to configure such as Memory XMP profile settings, custom fan profile settings or other specific settings you may have previously had configured that were wiped out by resetting the CMOS.

If the system will not POST after resetting the CMOS, then there is a hardware problem of some kind.


You can also do a thorough bench test.

Beginners guide to bench testing your motherboard​