Peace and quite! Yippee! I just installed my 4100 replacement fan and WOW! Amazing! I can barely hear it; just enough to know it is working. And, to give credit where it is due, I would like to thank Cody for his putting up with all of us “fan” people, and would like to mention that I received the fan within two days of the call. I am not a hardware kind of guy but replacing it on my own was a snap (after having taken the original one out while on the phone with a tech to confirm the model number.) I feel I have received the kind of service I expected to receive from Dell. Thanks.