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Cannot control desktop case fan

HP Recommended
Compaq CZC74631XL dc7700p convertible minitower
Microsoft Windows 7 (32-bit)

After pressing the power button to start.

 

Screen mesage

 

3072 MB

 

512-chassis fan not detected

 

Initializing Intel(R) Boot Agent GE v1.2.40

PXE 2.1 Build 085 (Wfm 2.0), RPL V1.32

 

F1 boot is highlighted in blue

 

The case fan is running at full speed

 

I press F1

 

Windows starts

 

Fan is still going full speed

 

Help! I cannot think for the noise.

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> 512-chassis fan not detected.

 

Because that fan is not running, your computer is starting to overheat.

So, the motherboard detects the elevated temperature, and tells the other fan to speed-up, which makes more noise, to try to move more room-temperature air through the case.

 

Check that the wires from the chassis fan (not the processor fan) are properly connected to the motherboard.

With the computer turned-off, and the power-cord disconnected, try to "spin" the chassis fan.

If it does not spin freely, it must be replaced.


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Hi

 

Thank you for taking the time.

 

The point about the fan is - it IS working. Flat out and all the time.

 

KR

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@Upholland wrote:

The point about the fan is - it IS working. Flat out and all the time.


Some computer have multiple fans:

  1. inside the power-supply - fan-blades visible from outside the back panel of the case,
  2. inside the back panel, to exhaust warm air -- this one is usually designed "chassis fan",
  3. Inside the front panel, to pull room-temperature air into the case,
  4. on top of the heat-sink on top of the processor,

Probably, fan #1 is working normally, fan #3 does not exist, fan #4 is making all the noise, fan #2 is generating the error-message.

 

With the computer turned off, remove a side-panel, and look for those fans.

Power-on the computer, and view the fans, to ensure that they are spinning.

 

It's also possible that fan #4 is defective -- not responding to commands from the motherboard to "slow-down", implying that it needs to be replaced.

 

 

 

 

 

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