Symptom
An Apple display with an Apple Display Connector (ADC) exhibits one or more of the following symptoms:
- Unable to turn on the display using the display's touch switch
- Display turns on then off
- Unable to open the System Preferences pane using the Launch touch switch
- USB devices don't work when plugged into the display's USB ports
Solution
- 1. Make sure the display cable is securely connected to the computer's video card. Turn on the computer to see if the symptom is gone. If not, continue with step 2.
2. Disconnect the display cable from the computer's video card.
3. Examine the Apple Display Connector on the display cable. Look for and carefully straighten any bent pins. Do not plug the display cable into the video card yet.
Figure 1 Apple Display Connector on display cable
4. Examine the Apple Display Connector on the video card. Look for any bent pins. Do not try to straighten them. Look for damage to the plastic housing surrounding the video pins.
Figure 2 Example of bent pins on a video card's Apple Display Connector
5. If you do not see any damage to the Apple Display Connector on the video card, reconnect the display cable. Turn on the computer to see if the symptom is gone.
6. If the symptom persists, or if the video card has bent pins, or its plastic housing is damaged, contact Apple or an Apple Authorized Service Provider for further assistance.
Note: Touch switches on some Apple displays can be disabled through the software. If the touch switches light up when touched but no action takes place, review technical document 58813, "LCD Displays: How to Disable Touch Switch" to determine whether the touch switches have been disabled.
Warning: If bent pins are found on either connector, the affected product should not be used until it has been repaired. Failure to do so will cause damage to any connector plugged into it.