For those who can't hear their fans...

This is pretty much my experience and you could follow my original posts if you care. I'm just going to break it down.
1st MBP - Week 12 build 2.16 1g 7200 which had to be returned because of the 4SN error message during hardware check. With this MBP I never heard my fans rev up no matter how hard I pushed the machine or how uncomfortably hot it got. Also, I noticed that the error would occur whenever the fans didn't turn on during the system test. This was during the week of April 1st. Went to the store and they kindly swapped the machine.
2nd MBP - Week 12 build 2.16 1g 7200 which also had to be returned. This one also had the 4SN error message during the hardware check and I never heard the fans rev up no matter how hard I pushed the machine. I went to the store to return the machine and I was told by a genius that the error is just a software glitch and as long as the machine is working properly then I shouldn't worry. I wasn't happy, but I needed the MBP and decided that I would hold on to it. After a few weeks I noticed the machine slowing down (marginally) and I occasionally had this issue where my screen would go all glitchy and the computer would freeze. This worried me and I returned to the apple store for it to be sent out for repairs. After explaining my problems (strange HD noise, screen flicker) and showing them a pic of the screen issue he the genius said my graphics card is fried and surprisingly, he wanted to swap the machine again (it was 20 days past the return policy date)! That was very nice of them, but I had to settle for a lower model.
3rd MBP - Week 17 build 2.16 1g 5400 which is running great. I had to settle for the 5400 model because apparently, the 7200 model is no longer an option at the store (you can get it on line). This was fine with me because they returned $400 to me due to the lower model and the genius made good points of battery life and heat. Also made me feel better about the whole 17" vs. 15" top model price point. Anyways, on to the fans. I actually hear them rev up at appropriate times and I never recive the 4SN error message.
What does this mean? Well, it's all speculation but, from my experiance you should hear your fans rev up when the computer is being taxed. With each of the 3 machines I did all the same processes and with the first 2 I never heard the fans. I did not keep the first one long enough to notice any process degradation and I'm not saying that there would have been one. As for the second MBP, I did notice degradation and throughout the weeks of owning that machine never once heard the fans rev up. I have had my third MBP for 2 weeks now and the heat is much better and I do hear the fans rev up occasionally.
Anyways, I love the new machine and I hope this helps people understand, a little more, about the fans/4SN error issues.

Yes I still have the whine, but I need to put my head to the keyboard to hear it.

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