Learn how to identify if your Intel-based Macintosh computer needs an EFI firmware update and how to apply EFI firmware updates to Intel-based Macintosh computers.
Macs that support OS X include built-in USB ports. You can use System Information or System Profiler to see how fast these ports are, and to see what’s currently connected to them.
The following is an overview of the startup sequence, error conditions, and behaviors for all Intel-based Macintosh systems.Note that some newer Macintosh models only use tones to indicate error conditions. See this article for more information.
The FaceTime HD Camera on your MacBook Air (Mid 2013) stops working with 32-bit applications (such as Skype, iMovie, Final Cut Pro, and QuickTime Player) after installing the OS X Mountain Lion v10.8.5 update.
Some MacBook Air (Mid 2013) computers may encounter an issue that, in rare instances, may cause an intermittent loss in wireless connectivity. The Wi-Fi menu bar icon may or may not indicate that a wireless connection still exists.
After installing Thunderbolt Firmware Update 1.2: Thunderbolt ports may not work. Target Display Mode may no longer work. The update may keep reappearing as available for download.
After installing the Boot Camp Support Software on a MacBook Air (Mid 2012), Microsoft Windows 8 may not start, or may start with a low screen resolution (VGA) .
Bluetooth enabled keyboards and mice may not pair or connect consistently, or audio from Bluetooth enabled earphones or speakers may be choppy. This can happen if certain external USB 3.0 devices are too close to your Mac.