Try booting to this Live Linux CD and using Server Administrator from there. [URL] 
I had EQ412 - RPM FAN 4 error message on my PE2650 rack server. Finding this means error on fan4 from Dell support, I have replaced the unit and confirmed that the fan worked fine. However, EQ412 - RPM FAN 4 error message still appear on the LED display. Anyone can advise me how I can get rid of this message, or if there still is more issue? Thank you,  Jonathan Kim
EQ412 - RPM FAN 4 error message appear after replacing CPU fan