Desktop has a noise that sounds like the fan

I turned on my IMAC desktop and there is a noise that sounds like the fan. The computer is very quiet till now. What should I do?

LexSchellings wrote:
Yes, I know, but it works as always, there is nothing to make it better; cf Perian.
iStat Pro does not quite work "as always" with newer systems.
For one thing, it may report inaccurate temperatures (& possibly fan speeds), depending on the Mac model it is running on. (For instance, on my system, it tells me the ambient temperature is around 54° F in a room that is actually about 77°.)
The problem is basically that iStat Pro gets temperature & fan speed info by querying the SMC subsystem. Apple has apparently changed the query/response protocols or the SMC hardware itself, so this no longer works as the utility expects.
And Banjo is not as "safe" and digs too deep with core kexts.
Banjo is the new name for the same company that developed iStat Pro & the original & newer iStat Menus programs. My guess is that the latest version of iStat Menus is just as safe to use as the earlier ones.
However, I won't use it for the same reason I won't use MenuMeters: both rely on MenuCracker, a hack to work around Apple's restriction of menu extras to ones Apple develops & distributes as part of the OS itself. Developers are specifically told to use 'Status Items' for their menu bar add-ons, which offer some but not all of the same functionality as menu extras, & do not risk destabilizing the OS or compromising its security.

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    LexSchellings wrote:
    Yes, I know, but it works as always, there is nothing to make it better; cf Perian.
    iStat Pro does not quite work "as always" with newer systems.
    For one thing, it may report inaccurate temperatures (& possibly fan speeds), depending on the Mac model it is running on. (For instance, on my system, it tells me the ambient temperature is around 54° F in a room that is actually about 77°.)
    The problem is basically that iStat Pro gets temperature & fan speed info by querying the SMC subsystem. Apple has apparently changed the query/response protocols or the SMC hardware itself, so this no longer works as the utility expects.
    And Banjo is not as "safe" and digs too deep with core kexts.
    Banjo is the new name for the same company that developed iStat Pro & the original & newer iStat Menus programs. My guess is that the latest version of iStat Menus is just as safe to use as the earlier ones.
    However, I won't use it for the same reason I won't use MenuMeters: both rely on MenuCracker, a hack to work around Apple's restriction of menu extras to ones Apple develops & distributes as part of the OS itself. Developers are specifically told to use 'Status Items' for their menu bar add-ons, which offer some but not all of the same functionality as menu extras, & do not risk destabilizing the OS or compromising its security.

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    Do 2-3 SMC resets and see if this takes care of the problem. If it does not then book an appointment with your local Apple Store to have it looked at by a Genius.
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