Apple MD094LL/A Manuale Utente

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

 2010-09-09

4.  Open System Preferences > 

Speech. Verify if the “Speak 

selected text when the key is 

pressed” checkbox is selected.

Yes

The key combination to speak 

text cannot be used for any 

other purpose. Either disable, 

or change to a more rare 

key combination (including 

Shift, Command, Option and 

Control).

No

Go to step 6.

5.  With optical media in the drive, 

hold the media Eject key. Verify 

if the eject symbol appears on 

screen and that optical media 

is ejected if present.

Yes

Normal media eject key delay. 

No repair necessary.

No

Go to 

 

symptom flow.

6.  Open System Preferences > 

Language and Text > Input 

Menu. Check “Keyboard Viewer”. 

From the Input Menu (flag) in 

the Menu Bar, choose “Show 

Keyboard Viewer”. Verify if keys 

pressed appear in Keyboard 

Viewer.

Yes

Keys recognized. 

Go to step 9.

No

Keys not recognized. 

Replace keyboard.

7.  Open TextEdit or another text 

application and try typing 

something using the non-

responding keys. Verify if 

they are typed in this other 

application.

Yes

Application-specific issue. 

Troubleshoot application.

No

Create a new user account 

in System Preferences > 

Accounts, log out from 

current user and log in with 

new user to isolate a User 

account related issue. If issue 

persists, reinstall Mac OS X 

from Install DVD.