USB Device Not Recognized

Unlikely cause: LCD display, power supply, hard drive, optical drive, fans

Quick Check

Symptoms

Quick Check

 

 

 

USB Device Not Recognized

1.

Reset SMC.

• USB wired keyboard/mouse not

2.

For printers and external USB drives, make sure

recognized

 

any external power source is plugged in and

• USB external drive not

 

operating to isolate a power issue with device.

recognized

3.

The iMac has 4 USB ports on rear of computer. Try

• USB camera not recognized

 

each port to isolate a particular port malfunction.

• USB printer not recognized

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 firmware updates for

 

 

this model have been installed to take advantage

 

 

of any available bug fixes.

 

7.

Launch Apple System Profiler 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

Yes

Test with all USB ports to

 

 

the computer except for USB

 

ensure all USB ports working

 

 

keyboard and mouse. Start

 

as expected. Replace logic

 

 

computer and reset PRAM.

 

board for any port failures.

 

 

Verify if USB keyboard and

 

 

 

 

No

Reset SMC. Go to step 2.

 

 

mouse are recognized.

 

 

 

 

 

 

 

 

 

 

2.

Verify if Bluetooth Mouse Setup

Yes

Bluetooth detected, but

 

 

assistant launches after startup.

 

external USB devices not

 

 

 

 

recognized. Go to step 3.

 

 

 

 

 

 

 

 

No

Disconnect USB keyboard and

 

 

 

 

mouse. Go to step 4.

 

 

 

 

 

 

2010-09-09

iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices  104

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Apple MD094LL/A manual Symptoms Quick Check USB Device Not Recognized