Should I be able to hear my fan?

I have a question. I hear all this discussion of mooing, and I've never heard it. I've gotten my mac book up to what coreduotemp reports as 75C and I've not heard any noise... including fans kicking on. If i put my ear really close I can hear that "whine" which goes away upon loading the processor, but that is it and its very faint. Should I be concerned that my fan doesnt work, or are they that quiet? Thanks

The fan is audible, but at 72~75C, (for my specific black macbook) the fan noise is very faint and can be confused with the hard drive noise. The optical drive definitely overpowers it.
It's easier to hear it (louder) at 69C when it's mooing.
If you just want to make sure your fan is working, use SystemLoad to ramp your CPU and raise the temperature. The fan should be definitely audible then.

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    my black macbook with 1gb ram is getting very hot when i use front row to play videos at full screen. after about 30-40 mins the left corner of the macbook is so hot i can only touch it for a second or so. then without warning the video just freezes. the picture remains on the screen but looks like it's paused. i then get the spinning colour wheel. the only way to rectify is to force a power off (force quit has no effect). i have to let it cool down for a while and try again. it works fine after that until it gets hot again.
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    Macbook Black 1gb Ram 120gb HDD   Mac OS X (10.4.7)  
    Macbook Black 1gb Ram 120gb HDD   Mac OS X (10.4.7)  

    UPDATE
    ok, so we have had the firmware update and guess what?
    all seems ok now!!!!
    coreduotemp now reports 65 degrees after playing video at full screen. much better than the 85 degrees it was hitting. now when it gets hot i can hear the fans going. i ran a terminal window and did yes > /dev/null and after only a few seconds the temp was rising to 85-87 and the fans came on really hard and brought it to 68-70. no system stall yet.
    normal idle while using only safari over airport is between 41-45 degrees!!!!
    i am very happy so far. lets just hope it is the cure.
    many thanks for reading and replying.
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    For the fan running continually, first try an SMC (System Management Controller) reset:
    http://support.apple.com/kb/HT3964
    Since you did not mention which model of MacBook you own, it's impossible to answer your battery question.
    Apple still sells original-equipment batteries for most models from the Apple Store online.
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                      Hi , I suhail khan from india and i am user of iMac system 10,1.These days i am facing the sound enabling issue with my iMac system I am not able to hear sound in my iMac system.So kindly suggest me how to enable sound in my iMac . Please no the needful.

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  • 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.
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    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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