Some Apple products contain sensors that respond when they detect temperature changes inside your system or device, turning on fans to bring cooling airflow to critical components.
Addressing various noises that may come from your Mac. At times you may notice odd buzzing or scratching sounds coming from your computer. There are numerous reasons for this, and while most are. First up, here’s why you can’t stop your Mac making a boot up sound by leaving your headphones plugged in: The reason why the Mac makes the start up sound - even if you have headphones plugged. Aug 19, 2014 Sometimes it's best for your Mac to be seen and not heard. Applications and services often make a sound associated with their notification, but did you know that sound can be deactivated? First of all, you can always mute the audio on your Mac all together — and sometimes that's a good idea. But other times you may want to hear audio from some apps (like iTunes, for. If your Mac is clean and grime-free and you are keeping your apps and tabs in check and the fan is still spinning frequently and loudly, then try resetting the System Management Controller (SMC).
About fan noise
If your device's processor is working on intensive tasks—such as compressing HD video, playing a graphics-heavy game, or indexing the hard drive with Spotlight after you migrate data—the fans run faster to provide additional airflow. You might hear fan noise when this happens, especially if you're in a quiet environment. This rushing-air sound is a normal part of the cooling process.
Ambient temperature, the temperature outside the device, also plays a role in the fans' responsiveness. If the ambient temperature is high, the fans turn on sooner and run faster.
If you hear the fans in your Mac Pro running at full speed and you aren't performing any intensive tasks, check the enclosure. Make sure that your Mac Pro is locked and fully seated, or that the top cover or access door is closed and locked on rack-mounted models.
Make sure the vents on your Apple product aren't blocked
Some Apple products have vents that let fans bring in cool air and expel hot air. Make sure that the vents aren't blocked to allow your device to perform at its best.
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The surface your device rests on can block its vents, affecting fan behavior. If you use your device on a soft surface like a couch, pillow, bed, or your lap, its fans might run more. Using your device on a hard, flat surface like a table or desk is best for temperature control.
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If the fans in your Mac run fast even when it isn't experiencing heavy usage and is properly ventilated, you might need to reset the System Management Controller (SMC) on your Mac. If you're experiencing this issue on an Apple TV 4K, Airport Extreme, or Airport Time Capsule, unplug the device, then plug it back in.
What Mac App Keeps Making Sounds
Learn more about the operating temperature of Apple notebook computers.
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