User Guide

Troubleshooting Symptom Charts/ USB Problems - 33
USB Problems
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.
1 Does the unit have the iMac Update 1.0? Ways to tell:
- Run Apple System Profiler. In the Device screen, the USB
version number in the upper left corner should be
greater than 1.0
- Do a Get Info on the OS ROM file in the system folder.
Under the name, it should be “iMac Update 1.0” or
greater.
Note: The iMac Update 1.0 improves the customer experience
with many USB peripherals. Apple recommends every iMac
customer install this update. The iMac Update 1.0 software is
available at no charge through Apple's Software Update Web site
http://www.apple.com/swupdates. Refer to TIL #44005 for
additional information.
2 Not enough power for the USB device to function. The
following error message will appear confirming that a device
cannot function at all due to a lack of power. This lack of
power (depending on the device) can be a result of a
disconnected external power source, or not enough power
available from the hub the device is connected to. The two
corrective steps listed in the dialog box (shown on the next
page) provide the user guidance in troubleshooting these
conditions.
3 USB device experiencing a partial lack of power. Similar to
the first error message, this error message indicates a device
may not completely function due to a partial lack of power and