Question Installed cpu fan, case fans not spinning and no display

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afffeee146

Oct 29, 2020
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So the title basically says it all, i installed a new cpu fan, a hyper 212 evo, the computer worked flawlessly before installing it but after, i can't even get into bios because no post, only no signal on monitor.
 
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So you opened the case, unplugged the wire of the old cpu cooler. Undid the screws/clips and removed it. Cleaned the old paste off the cpu. Broke out the Hyper212, sorted out the bracket, put a dab of paste on the cpu, mounted the Hyper212 correctly and plugged its wire right back in the same slot on the motherboard that the old fan plugged into.

That's in a nutshell, the procedure.

If you missed/skipped any steps of that, you'll have problems. If you unplugged something else and didn't return it, you'll have problems.

So my question is, what else did you do that's not in the above procedure? Did you push the power button on the back of the power supply by accident?
 
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i did replace thermal paste, yes it was working right before i installed the cpu fan.


specs:
intel core i7 8700k
geforce gtx 1660 super
asus prime z390 p
antec vp550p i think, 550w
2x8 3200mhz hyperx fury rbg ram
samsung 970 evo ssd 500gb
dont know the name of the hdd
 
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Karadjgne said:
So you opened the case, unplugged the wire of the old cpu cooler. Undid the screws/clips and removed it. Cleaned the old paste off the cpu. Broke out the Hyper212, sorted out the bracket, put a dab of paste on the cpu, mounted the Hyper212 correctly and plugged its wire right back in the same slot on the motherboard that the old fan plugged into.

That's in a nutshell, the procedure.

If you missed/skipped any steps of that, you'll have problems. If you unplugged something else and didn't return it, you'll have problems.

So my question is, what else did you do that's not in the above procedure? Did you push the power button on the back of the power supply by accident?
Click to expand...
I did everything you wrote, nothing more, nothing less.
 
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Most likely idea is you bumped something else and disconnected it without realizing. Linked thought: did you disconnect and then REconnect the CPU Power cable near the CPU socket?

Another possibility is a poor connection of the cable to Pin #3 of the CPU_FAN header. I am assuming you plugged the new CPU fan into that header. A secondary but vital functioon of the CPU_FAN header is to monitor the Speed signal coming back to it on Pin #3 from the fan for FAILURE. And that's what it would decide if it gets NO speed signal there. If that happens, many mobos will not even let you boot up. It can happen if the fan is faulty and truly does not ever start. It can happen if the fan works just fine, but fails to send its speed signal to the header. It can happen if the signal is sent, but there's bad connection at the header pins. It can even happen if all that works, BUT the fan speed is so low that the mobo determines that the speed is below some set minimum, and calls that a fan failure. (Your manual p. 2-38 shows how to set the min speed limit.)

Try these steps.
1. When you push the on / off button, does the new CPU fan twitch at all? Does it start and run? If it does nothing, that's a real problem. If that happens, try this BRIEF test. Disconnect that fan and plug it into any other mobo fan header, like one of the CHA_FAN headers. Now get out the fan of your old CPU cooler that you know worked, and plug that into the CPU_FAN header. Try to turn on. If it WILL boot up that way with the old fan working, but the new fan still does nothing, turn off quickly. You MUST NOT run your system with no CPU cooling. But this test will tell you whether the new fan works, and whether the mobo would be happy if only it got a good fan speed signal.
2.Using the proper "normal" connections, IF the new fan starts and keeps running for a while at least and nothing else seems to work, does that fan then shut down again? If it shuts down in a short time, maybe its speed signal is not getting through and the system is shutting down AFTER it finds the fan has "failed". If that is what happens, then the fan CAN cool the CPU, and you can try the fan-swap test above again. BUT this time let it run long enough that you can go into BIOS Setup and look at the SPEED shown for the CHA_FAN header that you plugged the REAL NEW CPU fan into. If there is NO speed, then you know the fan is failing to send out that info. If there is a speed, what is it? Is it low enough to be seen by the CPU_FAN header as too low? Maybe you can adjust the CPU_FAN header's minimum speed. ALL the time you are doing this, keep close eye on what the CPU TEMPERATURE is. If it goes too high, shut down!!

By now you'll know whether the fan can start and run and cool the CPU. And you'll know whether it generates and sends out a speed signal. And you'll know whether your system will run if it DOES get a good speed signal at the CPU_FAN header.
 
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Paperdoc said:
Most likely idea is you bumped something else and disconnected it without realizing. Linked thought: did you disconnect and then REconnect the CPU Power cable near the CPU socket?

Another possibility is a poor connection of the cable to Pin #3 of the CPU_FAN header. I am assuming you plugged the new CPU fan into that header. A secondary but vital functioon of the CPU_FAN header is to monitor the Speed signal coming back to it on Pin #3 from the fan for FAILURE. And that's what it would decide if it gets NO speed signal there. If that happens, many mobos will not even let you boot up. It can happen if the fan is faulty and truly does not ever start. It can happen if the fan works just fine, but fails to send its speed signal to the header. It can happen if the signal is sent, but there's bad connection at the header pins. It can even happen if all that works, BUT the fan speed is so low that the mobo determines that the speed is below some set minimum, and calls that a fan failure. (Your manual p. 2-38 shows how to set the min speed limit.)

Try these steps.
1. When you push the on / off button, does the new CPU fan twitch at all? Does it start and run? If it does nothing, that's a real problem. If that happens, try this BRIEF test. Disconnect that fan and plug it into any other mobo fan header, like one of the CHA_FAN headers. Now get out the fan of your old CPU cooler that you know worked, and plug that into the CPU_FAN header. Try to turn on. If it WILL boot up that way with the old fan working, but the new fan still does nothing, turn off quickly. You MUST NOT run your system with no CPU cooling. But this test will tell you whether the new fan works, and whether the mobo would be happy if only it got a good fan speed signal.
2.Using the proper "normal" connections, IF the new fan starts and keeps running for a while at least and nothing else seems to work, does that fan then shut down again? If it shuts down in a short time, maybe its speed signal is not getting through and the system is shutting down AFTER it finds the fan has "failed". If that is what happens, then the fan CAN cool the CPU, and you can try the fan-swap test above again. BUT this time let it run long enough that you can go into BIOS Setup and look at the SPEED shown for the CHA_FAN header that you plugged the REAL NEW CPU fan into. If there is NO speed, then you know the fan is failing to send out that info. If there is a speed, what is it? Is it low enough to be seen by the CPU_FAN header as too low? Maybe you can adjust the CPU_FAN header's minimum speed. ALL the time you are doing this, keep close eye on what the CPU TEMPERATURE is. If it goes too high, shut down!!

By now you'll know whether the fan can start and run and cool the CPU. And you'll know whether it generates and sends out a speed signal. And you'll know whether your system will run if it DOES get a good speed signal at the CPU_FAN header.
Click to expand...
I'll do this when i get home in a few hours and get back to you whether it worked or not, thank you in advance.
 
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Paperdoc said:
Most likely idea is you bumped something else and disconnected it without realizing. Linked thought: did you disconnect and then REconnect the CPU Power cable near the CPU socket?

Another possibility is a poor connection of the cable to Pin #3 of the CPU_FAN header. I am assuming you plugged the new CPU fan into that header. A secondary but vital functioon of the CPU_FAN header is to monitor the Speed signal coming back to it on Pin #3 from the fan for FAILURE. And that's what it would decide if it gets NO speed signal there. If that happens, many mobos will not even let you boot up. It can happen if the fan is faulty and truly does not ever start. It can happen if the fan works just fine, but fails to send its speed signal to the header. It can happen if the signal is sent, but there's bad connection at the header pins. It can even happen if all that works, BUT the fan speed is so low that the mobo determines that the speed is below some set minimum, and calls that a fan failure. (Your manual p. 2-38 shows how to set the min speed limit.)

Try these steps.
1. When you push the on / off button, does the new CPU fan twitch at all? Does it start and run? If it does nothing, that's a real problem. If that happens, try this BRIEF test. Disconnect that fan and plug it into any other mobo fan header, like one of the CHA_FAN headers. Now get out the fan of your old CPU cooler that you know worked, and plug that into the CPU_FAN header. Try to turn on. If it WILL boot up that way with the old fan working, but the new fan still does nothing, turn off quickly. You MUST NOT run your system with no CPU cooling. But this test will tell you whether the new fan works, and whether the mobo would be happy if only it got a good fan speed signal.
2.Using the proper "normal" connections, IF the new fan starts and keeps running for a while at least and nothing else seems to work, does that fan then shut down again? If it shuts down in a short time, maybe its speed signal is not getting through and the system is shutting down AFTER it finds the fan has "failed". If that is what happens, then the fan CAN cool the CPU, and you can try the fan-swap test above again. BUT this time let it run long enough that you can go into BIOS Setup and look at the SPEED shown for the CHA_FAN header that you plugged the REAL NEW CPU fan into. If there is NO speed, then you know the fan is failing to send out that info. If there is a speed, what is it? Is it low enough to be seen by the CPU_FAN header as too low? Maybe you can adjust the CPU_FAN header's minimum speed. ALL the time you are doing this, keep close eye on what the CPU TEMPERATURE is. If it goes too high, shut down!!

By now you'll know whether the fan can start and run and cool the CPU. And you'll know whether it generates and sends out a speed signal. And you'll know whether your system will run if it DOES get a good speed signal at the CPU_FAN header.
Click to expand...
Just one question, why would the cpu fan have anything to do with the case fans? My cpu fan is working properly but my case fans doesn't. Also i don't have my old motherboard nor my old cpu fan unfortunately. So i have no way of testing it the way you described.
 
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So i recently had a problem with my case fans, i took every component out of the computer and reinstalled everything, it started working. I started up my computer and monitor says no signal, i tried pressing both f2 and del to get into bios even tho it said no signal but nothing. After about a minute my hdd stopped spinning(or whatever you say, the sound it makes). Is it a psu issue? Like the computer not getting enough power? I have tried putting the sata cable into all four connectors but nothing, i tried changing the molex connector that goes into the hdd even, still nothing. please help. im really frustrated..
 
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