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POST error 900 CPU fan not detected

HP Z240
Microsoft Windows 7 (64-bit)

POST error the CPU fan is not detected.  Then get 901 for rear fan and 902 for power supply.  This is a brand new system.  Opened her up and it is clean as a whistle (about 2 months old).  shut it down and unplugged the connectors hit with an eraser, plugged them back in.  Fans are running at FULL tilt.  can install a controller if needed, but concerned that with a brand new PC already have issue. 

Thanks!

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POST error 900 CPU fan not detected

> This is a brand new system.  ...   Fans are running at FULL tilt. 

 

I presume that the warranty for your HP system is still valid. 

Contact HP Support (hyperlink at the bottom-left of this web-page), to open an incident.

 

Fans *DO* run at 100%, until the motherboard detects that the computer's internal temperatures are not high-enough to justify spinning the fans at 100% -- the fans are told to "throttle-down" to a slower/quieter speed.

 

I think that you have a failing motherboard.

HP will replace it, under warranty.

 

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