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I still don't see why it being an hp should matter if they are using a standard 3pin or 4pin fan connector, but you never know what these manufactures may change. Have you tested the "fake fan sensor" you made with something more simple like a desktop? I tested mine in my desktop first. in the...

@SilentDecode You shouldn't need that forth pin. it is just used to control the fan speed. What is important is the yellow wire (the third pin), which is telling the computer what speed the fan is spinning with one of the fake sensors I made I am using it with a supermicro h8sgl-f-o server...

I want to add a thanks to Mohonri for the diagram posted. I was looking for something to stop the no cpu fan error i was getting due to my water cooling and this worked perfect. One note I want to add for anyone who may attempt this. The pinout of the LM555N is not how it was on the diagram...