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Big Problem After Installing CPU Cooler....

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CPUs Expert
Motherboard Expert

Hi Everyone,

Yesterday I installed my new Thermalright True Black with two 120mm Cooler Master 90CFM fans in my new cabinet. But that's where my problem begins.

1. After installing the cooler my some of the screws in the motherboard don't fit anymore as the backplate of the CPU Cooler has increased the height of the motherboard a little so the screws don't fit anymore. My motherboard is a little bent from the weight.

2. After putting it all together my CPU doesnt boot. When i switched on my PC for the first time, I got an error at POST saying:
"CPU Fan Error!
Chassis Intruded.
System Halted."

After a few restarts my system doesn't even boot. After pressing the power switch the switching from the cabinet the fans spin for a sec and then stop. After that nothing happens.
Please help.

More about : big problem installing cpu cooler

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CPUs Authority
Motherboard Expert

are they actual standoffs o just dimples in the backplate?

I had similar with my p5b (which is why i asked), after replacing the cpu it needed bios reset to cope with the chassis intrusion issue, i think i had to leave it without battery for a while as well as doing a reset. I found it to be a common issue when searching on the web for that problem, so there might be other tips out there that i've forgotten.
CPUs Authority
Motherboard Expert

you'd screw the standoffs into the backplate and then you screw the screws for the mobo through the mobo into the open end of the standoffs. They are typically a brassy colour.

I can't imagine youve got it wrong unless they were just not there.
CPUs Expert
Motherboard Expert

Thanks for the help. I finally fixed my PC and it working. But the problem is every time i boot, i get this "CPU Fan Error" at BIOS! And I have to press F1 to resume to boot up process. Is it becuase that the stock Intel heat sink is not attached to the motherboard?
CPUs Expert
Motherboard Expert

After installing the CPU Cooler there is no connection of any fan to the motherboard. Because till now only the my E8400's stock cooler was connected to the motherboard to the pin slot! Now since all the 120mm fans are connected to molex of the PSU!
CPUs Expert

hell_storm2004 said:
Many people use CPU Coolers, would like to know the workaround for this? Someone please suggest.


Many people do use them yes but they also make sure they are still using at least one four pin CPU fan connected to the motherboard header.

The reason you are having a problem is because it's a safety feature built into the board and a good one at that.

This way if the CPU cooling fan stops you will know there is an issue whereas when you use the molex connectors you don't.

You may be able to overcome this in the BIOS as suggested but that still doesn't make it a good idea to do so.
CPUs Authority
Motherboard Expert

How many pins? If three I would put it in a case fan header and set thermal trip in the bios, just in case of a fan failure. Or you could get an adapter, 3 to four pin.
CPUs Authority
Motherboard Expert

Oh forgot the other part of your question...

The temperature really depend on the heatsink, ambient temperatures, fan speed, ect.
I would say under 45c for idle and hopefully under 70c for full load.
CPUs Expert
Motherboard Expert

Mine is at 38 deg to 42 deg on idle. Didn't run the processor on load till now so cant say how much that temperature will be! Thanks. I have installed all the fans to the mobo. Except one, there were no pins left! :D 

1st of all, sorry to bump this old Post

but just want to share, if any of Asus's Mobo user got this kind of warning after installing a new Cooler, and getting the "System Fan not detected!" warning at bios window, all you have to do is, go to the BIOS, then go to the Fan Speed Monitor Section, and there should be a CPU Fan Speed at "n/a"

change it to "Ignore"

and F10 to save and exit

the reason is that the Mobo think that the fan is still there, where you already use your own Cooler, so it doesnt detect and gives you that warning

i hope this helps, because many people also asked me for this simple error
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