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HP Recommended
HP Z 240 sff
Microsoft Windows 10 (64-bit)

Hi hello to everyone i'm new here and hope to find some help from the community?I changed my cpu in a hp z240 sff and at every boot i have an error message saying: Post error  "error fan detection" i make "enter key" and the computer runs well, i have plugged the fan from the cpu and it's working fine but at each boot i have the same message how can i solve this problem i tried a cmos with no result and in bios i didn't saw any option about fan?I wait an explanation from a member,,have a nice day (just to add i'm french so i hope my message will be understandable )😀 (before i change the cpu there was no error message during boot)

you have to act not react
1 ACCEPTED SOLUTION

Accepted Solutions
HP Recommended

Hi i solved the problem with installing a fan with 4 pins on the motherboard at 25 connector named rear fan (marked A on the picture joined)and there is no more post message with fan error detection.I hope this will help someone who have this kind of problem.fan 25 z240.PNG

you have to act not react

View solution in original post

4 REPLIES 4
HP Recommended

@pull-lift -- is there another fan (maybe on the back-panel) that is not spinning when the computer is powered-on? Is the cable from that fan NOT connected to the motherboard?

 

HP Recommended

Hi there is the cpu's fan and the fan from the power supply,both are spinning during boot so i don't understand why the POST message is displayed?Have a nice day greetings.😊

you have to act not react
HP Recommended

@pull-lift -- it is the three-wire fans that provide feedback to the motherboard, indicating the speed (RPM) of the fan. Your computer probably has a two-wire fan inside the power-supply.  So, check your three-wire fan(s), to ensure that they are spinning fast-enough to avoid the error-message. Also, check the motherboard settings, to not try to monitor any non-installed fan.

 

HP Recommended

Hi i solved the problem with installing a fan with 4 pins on the motherboard at 25 connector named rear fan (marked A on the picture joined)and there is no more post message with fan error detection.I hope this will help someone who have this kind of problem.fan 25 z240.PNG

you have to act not react
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