LED Cinema Display (27-inch) Symptom Charts — Startup and Power Issues 17
2010-11-18
Symptom Charts
Follow steps in the order indicated below. If an action resolves the issue, retest system to verify.
Startup and Power Issues
Dead Unit / No Power
Unlikely cause: fan, camera, speakers, subwoofer, microphone
Quick Check
Symptoms Quick Check
Dead Unit / No Power
• No power
• No image
• No fan spin
• No active MagSafe LED when
MagSafe is connected to a
MacBook /MacBook Pro
• No iPod/iPhone/iPad is
charged/powered when
connected to USB ports on
display
1. Verify power cord and AC wall outlet.
2. Verify USB/Mini DisplayPort/MagSafe connectors
are fully seated.
3. Check brightness setting.
4. Verify display is used with a supported system
with up-to-date system software.
5. Test display with a known-good system.
If used as second display, open Display
Preferences (or press Option-F2) and check for
presence of the middle Arrangement tab to
conrm that display is recognized.
Deep Dive
Check Result Action Code
1. Connect display to a known-
good supported computer and
check in System Proler’s USB
device tree that display’s USB
hub and built-in camera are
listed.
Yes Power is present on the
display logic board.
Go to Blank / No Video, No
Backlight.
No Go to step 2.
2. Unplug and replug Mini
DisplayPort connector into
a known-good supported
portable computer and
monitor the portable’s display.
Verify that portable’s display
briey turns o then back on.
Yes LCD panel is powered and
video signal is asserted.
Go to Blank / No Video, No
Backlight.
No Go to step 3.
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