iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices 106
2010-09-09
Wired Keyboard Does Not Function Properly
Quick Check
Symptoms Quick Check
Wired Keyboard Does Not
Function Properly
• Some or all keys on the
keyboard don’t work
• Eject key or Caps Lock key
doesn’t seem to work
• Some keys don’t work as
expected
1. Reset SMC
2. Open System Preferences > Universal Access >
Mouse & Trackpad and verify that Mouse Keys
is turned OFF. When enabled, Mouse Keys can
disable functionality of some or most keys,
depending on keyboard used.
3. The iMac has 4 USB ports on rear of computer.
Make sure to try each port to isolate a particular
port malfunction.
4. Test with a known-good wired keyboard to
isolate a failed peripheral issue.
5. Test wired keyboard on a known-good, same-
model computer. If it works on the other
computer, this may indicate a bad USB port if
keyboard doesn’t work at all on user’s computer,
or a software issue if keyboard is working but not
as expected on user’s computer.
6. Ensure that all software and rmware updates for
this model have been installed to take advantage
of any available bug xes.
Deep Dive
Check Result Action Code
1. Verify if all keys on keyboard
work.
Yes Go to step 2.
No Go to Keyboard: Specic
Keys Do Not Respond
symptom ow.
2. Verify if Caps Lock is working as
expected.
Yes Go to step 3.
No Go to Keyboard: Specic
Keys Do Not Respond
symptom ow
3. Verify if media Eject key is
working as expected. Note that
to prevent accidentally ejecting
media, Mac OS X adds a slight
delay to the media Eject key
before it takes eect.
Yes Go to step 4.
No Go to step 5.