Typing on the keyboard produces nothing on the screen.

One of the following is probably the cause:

mYour system has a software problem.

Restart your Macintosh. For instructions, see “Start Over” in the section “When You Run Into Trouble” earlier in this chapter.

Check the startup disk and application program you were using when the problem occurred. Make sure that all programs, desk accessories, and system extensions you’re using are compatible with the system software.

If the problem recurs, you may need to reinstall system software. See “Installing or Reinstalling System Software” later in this chapter for instructions.

mYou haven’t selected any text or set the insertion point (9).

Make sure the program you want to type in is the active program. Then place the pointer (8) in the active window and click to set an insertion point (9) or drag to select text (if you want to replace the text with your typing).

mThe keyboard is not connected properly.

Turn off the computer using the power switch, then check that the keyboard cable is connected properly at both ends.

If you have a keyboard with an ADB port (marked with the icon) on each end, turn off the Macintosh using the power switch and plug the keyboard cable into the other ADB port on the keyboard. (You may have to unplug the mouse to do this.) Then restart the computer.

Many Macintosh computers have two ADB ports on the back panel. Also, some monitors have one or two ADB ports. Turn off the Macintosh using the power switch and connect your keyboard cable to a different ADB port on the computer or monitor. Then restart the computer.

mThe keyboard is damaged.

If you have access to another keyboard, try using it instead. (Turn the computer off before connecting it.) If the new keyboard works, there is probably something wrong with the one you replaced.

If none of these procedures solves the problem, consult the service and support information that came with your computer for instructions on how to contact an Apple-authorized service provider or Apple for assistance.

58Chapter 5

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Apple 550 series, 570 series manual Typing on the keyboard produces nothing on the screen
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570 series, 550 series specifications

The Apple 550 and 570 series are notable entries in Apple's lineup of devices, typically recognized for their blend of performance, efficiency, and user-friendly design. With a focus on delivering high-quality features, these series have attracted attention from both tech enthusiasts and general consumers alike.

The Apple 550 series is anchored by its sleek design, often characterized by an aluminum chassis and vibrant Retina display. One of the standout features of this series is its use of the M1 chip, which enhances performance across applications while maintaining impressive battery life. This chip, based on ARM architecture, integrates an 8-core CPU and an 8-core GPU, allowing for seamless multitasking and exceptional graphics performance. Additionally, the 550 series boasts elevated RAM options, making it suitable for power users and professionals in creative fields.

On the other hand, the Apple 570 series builds on the foundation of its predecessor, offering new advancements while retaining core features that users love. The 570 series also utilizes the M1 chip, but with the evolution of the series, Apple may introduce enhancements such as increased clock speeds or supplementary cores for even greater performance gains. This series is often highlighted for its advanced thermal management system, ensuring that the devices run cooler under heavy workloads.

Both series support industry-leading technologies such as Thunderbolt 3 and USB-C, enabling high-speed data transfer and versatile connectivity options. This feature is particularly beneficial for users who require fast access to external storage, displays, or docks. Furthermore, these devices typically come with upgraded audio systems that provide clear, immersive sound, enhancing the multimedia experience for users, whether during casual listening or professional production.

In terms of build quality, both the 550 and 570 series are designed with sustainability in mind, incorporating recycled materials and energy-efficient components. They also run on macOS, which offers a robust ecosystem, ensuring a seamless user experience across Apple devices.

With exceptional performance, cutting-edge technologies, and commitment to sustainability, the Apple 550 and 570 series stand out as impressive offerings within the technology landscape, catering to a diverse range of users from everyday consumers to creative professionals.
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