Watercooling full speed at startup, but no CPU fan error in boot stage

feng1807 · Dec 5, 2017

Hi everyone,

Something odd happed to me and almost drove me crazy these days.

About two weeks ago, when I was normally using PC, suddenly the hard disc D disappeared. I thought maybe the power cable on disc D disconnected. I open the case and check the power cable to hard disc, and restart. The disc D didn't show up. Then I doubted maybe something wrong with power cable. I replace the power plug with case fan power plug.

When I start PC, the nightmare begins. The water-cooling CPU fan was spinning at full speed, and it shows no CPU fan at boot. I searched a lot, and tried many solutions, like ignore the CPU fan speed in Bios. Then I could go into the windows, but bluescreen happened, due to the CPU over temperature protection.

I changed the water cooling fan back to the original Intel CPU fan, but same problem happed. No CPU fan, the CPU temperature increased until the over temperature protection triggered.

Then I thought maybe the motherboard was failed. I bought new motherboard, new CPU, new DDR4 RAM at black Friday, and I built them up yesterday. When I start the PC, I was psychological collapsed. The problem is still there, but my money was gone.

Specs:

ASUS Prime Z370-P, Socket-1151
Intel Core i3-8350K
Corsair Hydro Series H115

Any help is appreciated.
Thank you for reply.
Br,
Feng

jgustin7b · Dec 5, 2017

There isn’t anything wrong. Make sure the the small power plug is attached to the port. The one with 6-8 ports and is usually next to the mobo main power port. If you tried one and it didn’t work and there is another similar port next to it, try that. Also, listing your current specs may be nice for this case.

feng1807 · Dec 5, 2017

jgustin7b :

Thanks for your reply, I will try another power plug to the motherboard

jgustin7b · Dec 5, 2017

Ah crap, sorry. That was the power plug to the cpu. There is although a 4 pin connector for the fans. But same idea.

feng1807 · Dec 5, 2017

jgustin7b :

you mean the 4 pin connetor from PSU? Now I'm not sure which connector. The CPU fan from water cooling is connected on the CPU fan header on motherboard correctly, I'm sure about this.
The power supply for the water cooling is a sata connector L shap connected to the power supply cable.

jgustin7b · Dec 5, 2017

If you have the cpu fan header on, that’s a good start. If there is another header for the cpu (some mobos have one, some odd ones have two) try it. If your water cooler does take power from the psu, try turning it on with and without the power supply cable. My fans rely on power from the mobo, while my side ones rely on Molex.

feng1807 · Dec 5, 2017

jgustin7b :

There is only one CPU fan header on my mobo. The water cooler was spinning at full speed at startup, so it got the power from PSU. I dont know where the problem is.

jgustin7b · Dec 5, 2017

I see. Your cooler is an AIO water cooler right? Your motherboard has a designated port like the CPU cooler for AIO pump. I’ll send you a link to your manual, and go to section 1.2.3

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1151/PRIME_Z370-P/E13411_PRIME_Z370-P_UM_WEB.pdf?_ga=2.247751182.84871242.1512487013-1698116700.1508075900

feng1807 · Dec 5, 2017

jgustin7b :

Ah, I indeed did not use the AIO_pump header on the mobo. Maybe it is the problem. I will try it when I back home later. Thank you so much.

jgustin7b · Dec 5, 2017

Sure thing. Next time, look at the manuals, ok?

feng1807 · Dec 5, 2017

jgustin7b :

I read the water cooler user manual carefully, and it said to connect the pump power pin to cpu fan header. There is no more connectors on my water cooler to the AIO pump connector. I tried to connect the cpu pin to the AIO pump connector, and the problem was not solved

jgustin7b · Dec 5, 2017

Does the pump itself have one or two connectors? Some pumps have a cable attached to the radiator to act as a cpu fan.

feng1807 · Dec 5, 2017

jgustin7b :

there are 4 cables out from the water cooler. 2 conneters for the 2fans from pump, 1 Sata connector to the psu. 1 cpu fan cable to the cpu fan header on mobo as the user manual said

jgustin7b · Dec 5, 2017

jgustin7b · Dec 5, 2017

Does your mobo have a 3 pin or 4 pin cpu_fan header? If 4, move the plug up/down. If 3, well, starting to run out of ideas.

jgustin7b · Dec 5, 2017

feng1807 · Dec 5, 2017

jgustin7b :

Yes, they are in correct connector. And this problem came suddenly. It works smoothly for a long while before the problem appears

jgustin7b · Dec 5, 2017

Right, this is a sudden issue.

Maybe set your bios to default settings, you can always return settings you don’t need afterwards.

If not, and Knowing your cpu fan headers are 4 pin, try moving the pins up/down/left/right.

Watercooling full speed at startup, but no CPU fan error in boot stage

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