Apple M8347LL/A User Guide - Page 181

Bad USB device., Bad logic board.

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Page 181 highlights

Troubleshooting Symptom/Cure Tables: System Problems After Startup - 49 USB problems refer to symptoms or issues that may occur with external USB devices that are attached to the iMac. This could include Apple and/or third-party USB devices. Possible Cause Possible Fix USB driver missing. This error message indicates the device's driver is missing. Customers will need to check the instructions that came with the device and install the Mac OS driver. Bad USB connector. Bad USB device. Bad logic board. Connect the problem device directly into one of the iMac USB ports or, if it's already connected to one of the iMac USB ports, switch it to the other port. Replace the USB device. Replace the logic board.

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Troubleshooting
Symptom/Cure Tables: System Problems After Startup - 49
USB driver missing.
This error message indicates the device's driver is miss-
ing. Customers will need to check the instructions that
came with the device and install the Mac OS driver.
Bad USB connector.
Connect the problem device directly into one of the iMac
USB ports or, if it
’
s already connected to one of the
iMac USB ports, switch it to the other port.
Bad USB device.
Replace the USB device.
Bad logic board.
Replace the logic board.
USB problems refer to symptoms or issues that may occur with external USB devices
that are attached to the iMac. This could include Apple and/or third-party USB devices.
Possible Cause
Possible Fix