Apple Displays: USB ports don't work
Symptoms
If the USB ports of an Apple display with an Apple Display Connector (ADC) won't work, a pin or pins on the connector may be bent.
When you turn on the computer you hear the startup sound and the picture on the display appears, but the USB ports on the display don't work.
Products Affected
Apple Studio Display 17" LCD, Apple Studio Display 17" ADC, Apple Studio Display 15" ADC, Apple Cinema Display ADC, Power Mac G4 (QuickSilver 2002ED), Power Mac G4 (QuickSilver 2002), Power Mac G4 (Mirrored Drive Doors), Power Mac G4 (Mirrored Drive Door 2003), Power Mac G4 (FW 800), Power Mac G4 (Digital Audio), Power Mac G4 (QuickSilver), Power Mac G4 (Cube), Power Mac G4 (Gigabit Ethernet), Power Mac G4 (PCI Graphics), Power Mac G4 (AGP Graphics), Apple Studio Display LCD (15")
Resolution
- 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.
- Disconnect the display cable from the computer's video card.
- Examine the ADC connector on the display cable. Look at each pin and carefully straighten any bent pins. Do not plug the display cable into the video card yet.
- Examine the ADC connector on the video card. Look for bent pins. Do not try to straighten them. Look for damage to the plastic housing surrounding the video pins.
- If you do not see any damage to the ADC connector on the video card, reconnect the display cable. Turn on the computer to see if the symptom is gone.
- If the symptom persists, or if the video card has a bent pin or bent pins, or if its plastic housing is damaged, contact Apple or an Apple Authorized Service Provider for further assistance.
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.