iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices 104
2010-09-09
USB Device Not Recognized
Unlikely cause: LCD display, power supply, hard drive, optical drive, fans
Quick Check
Symptoms Quick Check
USB Device Not Recognized
• USB wired keyboard/mouse not
recognized
• USB external drive not
recognized
• USB camera not recognized
• USB printer not recognized
1. Reset SMC.
2. For printers and external USB drives, make sure
any external power source is plugged in and
operating to isolate a power issue with device.
3. The iMac has 4 USB ports on rear of computer. Try
each port to isolate a particular port malfunction.
4. Test with a known-good wired keyboard or
mouse to isolate a failed peripheral issue.
5. Test with a known-good USB cable when dealing
with a printer or external USB drive, to isolate a
USB cable issue.
6. Ensure that all software and rmware updates for
this model have been installed to take advantage
of any available bug xes.
7. Launch Apple System Proler and verify if device
is visible on USB bus. If yes, then the USB port and
cable are functioning properly. Contact device
manufacturer to verify that device is supported.
Deep Dive
Check Result Action Code
1. Unplug all USB devices from
the computer except for USB
keyboard and mouse. Start
computer and reset PRAM.
Verify if USB keyboard and
mouse are recognized.
Yes Test with all USB ports to
ensure all USB ports working
as expected. Replace logic
board for any port failures.
No Reset SMC. Go to step 2.
2. Verify if Bluetooth Mouse Setup
assistant launches after startup.
Yes Bluetooth detected, but
external USB devices not
recognized. Go to step 3.
No Disconnect USB keyboard and
mouse. Go to step 4.