Boot Fan Warning

[Pedsm]

I am not sure if this is the right place to put it but it is related to fans so...

 

I had an old computer gathering dust with Windows Vista still, so i decided to clean it up and do some cable management (apparently HP don't like to cable manage at all) and after cleaning the hard drive I installed Ubuntu server so i could use it for a few thing around the house, However after I cleaned the computer up and turned it on after about a year or so without turning on I realised the System fan header wasn't powering the fan which was weird, after messing around I realised the fan turns on for a few seconds and then it stops, because I am lazy I just installed the fan with a 3 pin to molex adapter if works more than fine, however every time i turn the computer on the Bios gives me an error saying no fan is detected on the 3 pin i can press f2 and dismiss it and it works but it is a hassle having to press f2 when the server is only plugged to the network and power constantly since I can remotely control it.

 

Do you guys have any ideas of what could I do to maybe fix the 3 pin on the motherboard or maybe fool the computer into thinking it has a fan in the system header?(I don't know what would happen if i just shorted the 3 pin but it should thing it has a fan connected am I right?)

[Tedster]

If you don't mind staying with your lazy fix, you can probably go into the BIOS and disable CPU fan warnings?

[failblox]

Is it the CPU fan header that's not working, or is it just a random fan? Cause if it's just a CPU fan, you might be able to disable the warnings from your BIOS.

[QueenDemetria]

Does the fan still spin freely? Or does it feel like it spins rough? If it spins freely, then the power for the fan is going out, but you can bypass that. If the fan doesnt spin freely, then replace it.