ÂWait a few seconds. If the computer still doesn’t start up, shut it down by pressing and holding the power (®) button for about 8 to 10 seconds. Disconnect all external peripherals and try restarting by pressing the power (®) button while holding down the Option key. When your computer starts up, click the hard disk icon, and then click the right arrow. After the computer starts up, open System Preferences and click Startup Disk. Select a local Mac OS X System folder.

ÂIf that doesn’t work, try using Disk Utility to repair the disk. For more information, see “Using Disk Utility” on page 49.

If your MacBook Air doesn’t turn on or start up

Try the following suggestions in order until your computer turns on:

ÂMake sure the power adapter is plugged into the computer and into a functioning power outlet. Be sure to use the 45W MagSafe Power Adapter that came with your MacBook Air. If the power adapter stops charging and you don’t see the indicator light on the power adapter turn on when you plug in the power cord, try unplugging and replugging the power cord to reseat it.

ÂCheck whether the battery needs to be recharged. If the light on the power adapter glows amber, the battery is charging. See “Running Your MacBook Air on Battery Power” on page 34.

ÂIf the problem persists, return the computer to its factory settings by pressing the left Shift key, left Option (alt) key, left Control key, and the power (®) button simultaneously for five seconds.

ÂPress and release the power (®) button and immediately hold down the Command (x), Option, P, and R keys simultaneously until you hear the startup sound a second time. This resets the parameter RAM (PRAM).

42Chapter 3 Problem, Meet Solution

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Apple MD761LL/A, MD760LL/A, MD712LL/A, MD711LL/A, MD223LL/A, MD224LL/A manual If your MacBook Air doesn’t turn on or start up
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MD760LL/A, MD224LL/A, MD232LL/A, MD712LL/A, MD761LL/A specifications

The Apple MD223LL/A, MD712LL/A, MD761LL/A, MD232LL/A, and MD224LL/A are part of Apple's lineup of MacBook Air and MacBook Pro laptops, which are well-known for their sleek design, robust performance, and efficient portability. Each model comes with unique features and characteristics, making them suitable for various user needs.

Starting with the MD223LL/A, also known as the MacBook Air (13-inch, Mid 2013), this model is celebrated for its ultra-thin design and lightweight at just 3.08 pounds. It incorporates a 1.3 GHz dual-core Intel Core i5 processor, which provides sufficient power for everyday tasks while ensuring energy efficiency. The 13.3-inch LED-backlit display offers a resolution of 1440 x 900 pixels, delivering vibrant colors and sharp image quality. With 4GB of RAM and a flash storage option of 128GB, this MacBook Air model offers speedy data access and decent multitasking capabilities.

The MD712LL/A, also recognized as the MacBook Air (13-inch, Early 2014), builds upon its predecessor with improved specifications, including a faster Intel Core i5 processor and enhanced graphics performance thanks to Intel HD Graphics 5000. Like the MD223LL/A, it maintains the same lightweight design, making it an excellent choice for users on the go. It also supports up to 512GB of flash storage, allowing for ample space and fast read-write speeds.

Moving to the MD761LL/A, which is the MacBook Pro (Retina, 15-inch, Mid 2014), this model stands out with its stunning Retina display featuring a resolution of 2880 x 1800 pixels. The combination of a powerful Intel Core i7 processor and dedicated NVIDIA GeForce GT 750M graphics card ensures that it can handle demanding tasks such as video editing and graphic design. Users can enjoy up to 16GB of RAM and can choose storage options up to 1TB, providing optimal performance for multitasking.

The MD232LL/A and MD224LL/A refer to the MacBook Pro (Retina, 13-inch, Mid 2014) series, which feature similar improvements in processing power and display quality. Both models offer a Retina display with a resolution of 2560 x 1600 pixels, giving users a bright and detailed visual experience. With options ranging from Intel Core i5 to i7 processors and up to 8GB of RAM, these notebooks cater to professionals and students alike who require portability without compromising performance.

In summary, the Apple MD223LL/A, MD712LL/A, MD761LL/A, MD232LL/A, and MD224LL/A are exemplary representatives of Apple's dedication to blending cutting-edge technology with user-centric design. Each model offers a distinct balance of performance, portability, and display quality, making them ideal choices for various computing needs. Whether for casual use or professional applications, Apple's MacBook series continues to be a reliable companion for users around the globe.
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