I just put a new CPU  in my old Dell 8400. The computer was a little dirty inside and  I blew all the dust out as best I could.   
The computer was never this noisy, That I can remember. 
The fan seems ok , no play in the bearings est..
Could I have hooked something up wrong and it thinks its warmer than it is?
The air seems nice and cool coming out the back. Blowing very hard at times sounds
like a jet to what it was before. 
All I did was blow it out good remove the shroud and heat sink ect.just  replace the 
CPU.
By the way old CPU was a P 4 3.0Gz  to a P 4 3.8 GHz

Thanks

Larry

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