I recently became a switcher to Macs with my purchase of a 1.83 GHz MacBook Pro. Although I very much like OS X, the MacBook Pro's problems annoy me--problems unacknowledged. Specifically, I am bothered by the noise problem and the heat problem, and mostly the former than the latter. I have a W8613-numbered unit but still experience noise and heat issues. Although the Magic Noise Killer reduces the hum, I do not consider it a proper solution as it is a hack and it diminishes battery life. I'm considering returning my still under 14-days old unit and demanded a full refund. I post here to ask for recommendations on what action to follow. I would like to remain a Mac user, but will not if issues persist. So, I would like to ask you the following questions: Has anyone successfully gotten his or her MacBook Pro repaired properly by Apple to eliminate the hum? Has anyone successfully negotiated a full refund (no restocking fee) within the 14-day return period? Beyond it? Does the serial number mean much? If I negotiate an exchange of my unit for a unit from a later batch, will these problems most likely be solved in the newer unit? Has anyone had successes or failures in negotiations with Apple that are relevant to this in any way? Does anyone have any relevant advice? Thanks for the help!