Updating imac firmware
If the drive is unable to be updated and you have a vibration problem, please contact your local authorized Apple dealer.
When Apple began shipping i Mac computers, the amber activity light on the i Mac CD-ROM drive was enabled.
According to Apple's release notes, the update includes bug fixes and is designed to improve the stability and performance of the products.
This update: - Fixes an issue which may prevent communication between clients on the same network - Improves performance with an extended guest network - Addresses potential naming conflicts with Bonjour Sleep Proxy Apple has also released a 7.7.7 update for its 802.11ac Wi-Fi Base stations, including the latest Air Port Extreme and Air Port Time Capsule models. The firmware updates can be installed through the Air Port Utility app for i OS or OS X.
Updating the firmware requires a reboot as usual and the Mac should be connected to a power source before proceeding.