[SOLUTION] Dell GX270 SFF CPU fan blowing too fast

I worked today on a Dell Optiplex GX270 SFF (this should apply to other GX270 SDT, SMT and GX260) in which the CPU fan blew at full speed beginning when you would touch the power button (before the CPU was even used).RA Grani

I swapped the CPU fan with a known good one and the problem was fixed.  It has CPU fan 9G180 in both the GX270 SFF and GX260 SFF I had on hand.