When you start up, a disk icon with a blinking question mark appears in the middle of the screen.

This icon indicates that your Macintosh cannot find the system software it needs to start up. One of the following is probably the cause:

mYour computer may be having a problem recognizing external equipment that uses the Small Computer System Interface (SCSI).

Turn off all external SCSI equipment and disconnect the first SCSI device in the chain from your computer’s SCSI port. Then restart the computer. If the computer starts up after you disconnect your SCSI equipment, refer to the manuals that came with the equipment for information on the proper way to connect SCSI equipment and assign SCSI ID numbers.

If you have a printer connected to your computer’s SCSI port, make sure your printer is not supposed to be connected to the printer port instead. Check the manuals that came with your printer for information on how to connect it properly.

mSystem software is not installed on the startup hard disk, the system software is damaged, or the hard disk is not working properly.

Start up your computer using the Utilities floppy disk or, if you have a built-in CD-ROM drive, with the Macintosh Performa CD. (For instructions on how to start up your computer from the CD-ROM disc, see “Starting Up From a CD-ROM Disc” in the section “Repairing a Damaged Disk” later in this chapter.) Then follow the rest of the instructions on repairing a disk to test your startup hard disk and repair any damage.

If repairing the disk doesn’t help, follow the instructions in “Installing or Reinstalling System Software” later in this chapter to reinstall system software on your startup hard disk.

52Chapter 5

Page 60
Image 60
Apple 550 series, 570 series manual Chapter

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.