Not every grumbling, muffled thudding or ticking is an issue, Apple suggests

Feb 12, 2010 09:46 GMT  ·  By

Apple’s all-in-one desktop computer, the iMac, is comprised of several mechanical components that exhibit various kinds of behavior in different circumstances. Sometimes, the computer will make noises that would suggest something is wrong with the device. However, this is rarely the case, an Apple Support document informs.

Last modified on February 11, 2010, Support article TS3204 reveals that, “The iMac (Late 2009), like most computers, has components that may generate small amounts of noise during use. In most cases these noises are normal and do not require repair or further evaluation.”

Referring to the new, 21.5-inch and 27-inch Late 2009 iMac models introduced in October 2009, Apple informs customers that both computers contain an intelligent control system that monitors temperatures while delivering the right amount of airflow to those components in need of cooling. The system handles three quiet fans, Apple reveals, noting that, “During CPU intensive activities the fans speed up to provide additional airflow. In a quiet environment the increased airflow may produce an audible noise that sounds like rushing air.” Generally, this is considered normal behavior.

However, if the customer has reasons to believe the fans are making unusual noises, or if the fans seem to run at full speed even when the computer is not handling tasks, he / she may want to reset the SMC (System Management Controller). The company lists this as a last resort. Users should first try some troubleshooting steps.

“The optical drive spins a CD or DVD at a high rate of speed during use,” Apple continues, informing customers that fans are not the only moving parts that make noises. “If your optical drive vibrates or makes a lot of noise when you use it, there may be an issue with the disc in it. Try using other discs to see if the issue is isolated to one disc,” the Mac maker advises customers. It adds that a disc whose weight is slightly off-center because it is uneven may cause this behavior. Still, Apple assures that this imbalance will not damage the disc or the iMac.

“Hard drives generate audible noises when performing read/write activities,” Apple stresses. “Even when a computer is idle it may be performing background tasks such as Time Machine backups or Spotlight searches that utilize the hard drive. These noises may be described as grumbling, muffled thudding, or ticking in short bursts, or as a quiet tapping noise like raindrops. These are all normal operating noises and do not indicate an issue.”

As with the aforementioned parts, if customers are skeptical, they are provided with methods of doing some investigation. In this case, the Disk Utility application can be employed to check the health of an iMac’s hard drive, according to Apple.