Contrast (O) and brightness (¤) controls on the front of the monitor don’t appear to work.

mFor Mac OS–based computers, your monitor may have the contrast (O) and brightness (¤) controls disabled. Click the Color button in the Monitors & Sound control panel and select Preferences. Under Calibration Protection, make sure that the checkbox to disable contrast and brightness controls is not marked; then, click OK.

The screen doesn’t dim when Energy Saver or other energy-saving software is on.

mMake sure the energy-saving software is installed properly and the amount of time you’ve set up to trigger it has passed. For Mac OS–based computers, see “Conserving Energy” in Chapter 2 for more information. For Windows-based computers, see the manual that came with your energy-saving software.

The screen flickers.

mMake sure the monitor cable is connected firmly to the correct port on the back of the computer.

mThe flickering could be caused by interference from a nearby power line or electrical equipment—for example, a radio, a microwave oven, or another computer. Try relocating nearby electrical equipment, or moving your computer and monitor.

mIf you have more than one monitor attached to your computer, the monitors might be interfering with one another. Make sure you’re using a shielded ADB connector cable. Move the monitors farther apart or set the monitors at an angle, so their screens are close and their back panels are farther apart. If, after moving the monitors more than 16 inches apart, you still see flickering, contact an Apple-authorized dealer or service provider.

mIf you are using a video card that has a very low refresh rate (below 67 Hz), the monitor may flicker. You may be able to change the refresh rate for the card. If possible, use a 75 Hz setting. See the manual that came with your video card for more information.

Tips and Troubleshooting

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Apple 850AV manual Screen flickers

850AV specifications

The Apple 850AV, introduced in the early 1990s, was part of Apple's pioneering line of personal computers that showcased advanced multimedia capabilities. The 850AV served as a significant milestone in the evolution of desktop computing, emphasizing audio and video processing in an era when such features were still in their infancy.

At the heart of the Apple 850AV was its robust Apple Macintosh architecture. It was powered by a Motorola 68040 CPU, which offered enhanced performance compared to its predecessors. With a clock speed of 25 MHz, this processor enabled users to run complex applications and manage multitasking more effectively. The system came equipped with a standard RAM configuration of 4 MB, expandable to 68 MB, allowing for smoother operation of demanding software.

One of the hallmark features of the 850AV was its built-in audio capabilities, which included stereo sound output and the ability to handle digitized audio. The system came with a high-quality microphone and a CD-ROM drive, which opened up new possibilities for multimedia applications, education, and entertainment. Users could engage with educational software, listen to CDs, and even create digital audio projects—all from the comfort of their desktop.

Additionally, the Apple 850AV supported video input and output, making it one of the first computers capable of video conferencing. This functionality was facilitated by the inclusion of a video camera interface, allowing users to connect external cameras and partake in video calls and recordings. The system’s graphics capabilities were also noteworthy, supporting an impressive display resolution that enhanced the visual experience for applications and games.

The machine was built around a sleek design, showcasing Apple’s commitment to aesthetics and usability. It featured integrated speakers, a keyboard, and a mouse, all designed to create a seamless user experience. The inclusion of various ports, including USB and SCSI, allowed for connectivity with numerous peripherals, expanding the system’s versatility.

Overall, the Apple 850AV was not just a personal computer; it was a multimedia powerhouse that laid the groundwork for future innovations in computing. Its forward-thinking design and capabilities reflected Apple's dedication to enhancing user experiences and pushing the boundaries of what personal computers could achieve in the realms of audio and video.