Troubleshooting Symptom Charts - 4
Symptom Charts
Note:
Check this section periodically for updates and new
symptoms and cures.
Important:
For procedures that require the monitor to be turned
on, allow the monitor to warm up for approximately 30 minutes,
unless instructed otherwise.
No Video
No video (screen is
black); power
indicator light off
1 Shut down computer and monitor. Inspect power cord for
damage; use ohmmeter to check for continuity.
2 Verify that monitor power cord is connected to power socket
on back of computer, that computer is connected to live
power source, that monitor power button is on, and that
computer connected to display is on.
3 Call Apple Technical Support. (In the US, call 1-800-919-
2775, option 3.)
No video (screen is
black); amber power
indicator light on
1 Check cable connections.
Important:
Be sure the USB and video cables from the
monitor are connected to the ports on the computer
.
2 Verify computer video signal by connecting known-good
monitor.
3 Call Apple Technical Support. (In the US, call 1-800-919-
2775, option 3.)
No video (screen is
black); green power
indicator light on
1 Check that front panel Brightness and Contrast controls are
not set to their minimum settings.
2 Check that video/USB cable connections are secure between
monitor, adapter, and computer.
3 Check that both pins at connector BL1 (from CRT yoke to
main deflection board) are seated properly.
4 Reinstall Apple Displays Software (version 1.7 or later).
Restart computer. Press and hold Command-Option-a-v
until the normal startup procedure has ended (since you
might have no video, allow one to two minutes).
5 Check for presence of high voltage (see “Checking High
Voltage” in this chapter). High voltage is present if you hear
a rustling sound when the display is turned on or off.
6 Call Apple Technical Support. (In the US, call 1-800-919-
2775, option 3.)
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