the fan is fine it was the power supply i cleaned and no its not normal it should make pulse not spinning constantly. the power supply was dirty as hell i even got a brand new power supply still does the same thing, what happen i saw the fan spin for a sec and stop dead then i cleaned power supply and now the fan keeps spinning but power the to board u can hear the hard drive/dvd drive lite ups but nothing on screen..everything clean i checked cpu no burn mark/capacitors not swolling..i was maybe thinking the fan wiring done..
IBM Thinkcentre A50 8177-7DG Pentium 4 HT 3.0GHz