IBM 865741Y Handbook - Page 181

Troubleshooting Monitor Problems Wavy, unreadable, rolling, distorted screen, or screen jitter. Wrong characters appear on the screen. Action If the monitor self-tests show that the monitor is working properly, verify that: 1. The location of the monitor is appropriate. Magnetic fields around other devices, such as transformers, appliances, fluorescent lights, and other monitors might be causing the problem. To determine if the location is causing the problem: a. Turn off the monitor. (Moving a color monitor while it is turned on might cause screen discoloration.) b. Adjust the placement of the monitor and other devices so that they are at least 305 mm (12 in.) apart. Also, when relocating the monitor, be sure that it is at least 76 mm (3 in.) from the diskette drives to prevent diskette drive read/write errors. c. Turn on the monitor. 2. An IBM monitor signal cable is properly connected to the monitor and server, and that the cable is installed securely. Non-IBM monitor signal cables might cause unpredictable problems. 3. You are not trying to run your monitor at a higher refresh rate than the monitor supports. Refer to the documentation that comes with your monitor for the supported refresh rates. Note: An enhanced monitor signal cable with additional shielding might be available for your monitor. Contact your IBM reseller or marketing representative for information. If the problem still exists, have the monitor and system serviced. Have the system serviced. General Problems Problems such as broken cover locks or indicator lights not working. Action Have the system serviced. Chapter 5. Solving Problems 163