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Gigabyte Z77X-UD3H CPU fan turns on then off, is this normal? (POST's fine)

  • Gigabyte
  • CPUs
  • Motherboards
Last response: in Motherboards
December 8, 2013 7:29:43 PM

Here is my build

My motherboard is a Gigabyte Z77X-UD3H, i5-3570k CPU, CM Hyper 212+ heatsink, RAM: G.Skill Sniper 8GB 1866Mhz. When I start my PC it boots up normally and has no problems POSTing, however there is something strange that is happening (I'm not sure if it's normal). I hit the start button, everything turns on, all the fans run, but then after about 2 sec the CPU fan stops running, 1 second later it turns back on and runs perfectly fine. My debug LED is going through all the motions telling me whatever its doing, the beginning code is "15" which my manual says is Pre-Memory Northbridge Initialization, it stays there for a bit, (2 sec max) (also when the CPU stops) but then boots up normally. I'm not sure if the CPU heatsink turning off then on is normal on this board, or the Z77 chipset. I've tried googling I tried the answer but everything I find is about some problems with debug codes and the mobo bootlooping or shutting off completey. I don't have any of these problems, my board boots up fine.

I tried a the stock heatsink I got with my 3570k and the same thing happens so it's not a problem with the hyper 212+ heatsink. Also I tried using the power button on the motherboard and not the case to make sure it wasn't a problem with my wiring of the power button/ panel. Just another theory to throw out there maybe the delay on the debug 15 code is because of my RAM? I'm using 1866, but I think I have to change something with the XMP profiles in the BIOS to get it to run at 1866, not sure if this has anything to do with the CPU fan turning on and off though. I've also tried one stick of RAM instead of two but the same thing happens. I've also tried raising the ram voltage to 1.65 but the same thing occurs.

Is this normal behavior?

Here is a video so it's a bit clearer as to what is going on

Thanks for all your help.

More about : gigabyte z77x ud3h cpu fan turns normal post fine

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a c 79 V Motherboard
December 8, 2013 9:05:02 PM

Yes it's normal behavior. My old and new system does this too.
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December 8, 2013 9:38:21 PM

lp231 said:
Yes it's normal behavior. My old and new system does this too.

Thanks! :)  it's my first time building a PC, so I wasn't sure whether or not this is supposed to happen.

cin19 said:
Recommend to 1) Download and install the chipset driver from intel website 2) Go into the BIOS set to XMP profile. If those don't help, then 3) update the BIOS.

I don't have an OS installed on my SSD yet. But once I installl it I will download the chipset drivers. When you say XMP profile that is for my RAM correct? what should I do there?

a c 444 à CPUs
a c 1717 V Motherboard
December 8, 2013 10:15:28 PM

In the memory section, check the manual.