Mac notebooks: Noise when powering on or waking from sleep is normal


When powering on or waking from sleep, some components in your notebook may make unfamiliar noises.


For instance, when optical (even if there is no disc inserted) and hard drives first receive power and make themselves ready for use a whirring or buzzing sound may be present for a few seconds. Additionally, fans in the computer may start off at full speed, but will taper off as the computer continues to start up or finish waking from sleep

Additional Information

Last Modified: Sep 4, 2012
Not helpful Somewhat helpful Helpful Very helpful Solved my problem
Print this page
  • Last Modified: Sep 4, 2012
  • Article: TS2224
  • Views:

  • Rating:
    • 60.0

    (659 Responses)

Additional Product Support Information

Start a Discussion
in Apple Support Communities
See all questions on this article See all questions I have asked