Apple MD094LL/A Manual Do Utilizador

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

 2010-09-09

3.  Verify if a known-good USB 

keyboard and mouse are 

recognized.

Yes

Test original USB mouse and 

keyboard. Replace if still not 

recognized. Go to step 5.

No

External USB ports not 

functioning. Replace logic 

board.

4.  With no USB devices 

connected, restart computer. 

Verify if Bluetooth Mouse Setup 

assistant launches after startup.

Yes

Bluetooth detected. 

Go to step 3.

No

Bluetooth not recognized. 

Internal and external USB not 

functioning. Replace logic 

board.

5.  With known-good USB 

keyboard and mouse working, 

test USB peripheral in question 

(USB hard drive or printer, etc.) 

Verify if device is recognized 

in Apple System Profiler under 

USB.

Yes

Device recognized. Test in all 

USB ports to ensure all USB 

ports working as expected. 

Replace logic board for any 

port failures.

No

Device may require more 

power than supplied by USB 

ports. Test with a powered 

USB hub. Go to step 6.

6.  Verify if using a powered USB 

hub resolves the issue.

Yes

Test device on the same 

USB port of a same-model 

computer without any other 

USB port populated. If other 

computer does not require 

a powered USB hub to allow 

the device functionality, 

replace logic board.

No

The computer’s USB ports 

and cable have been verified. 

Ensure all software and 

firmware updates have 

been applied for computer 

and device. If issue persists, 

contact device manufacturer 

for support. .