iMac (21.5-inch, Late 2009) Symptom Charts — Input/Output Devices 90
2010-11-18
Wired Keyboard Does Not Function Properly
Unlikely cause: LCD display, power supply, hard drive, optical drive, fans
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 USB Device Not
Recognized symptom ow.
2. Verify if Caps Lock is working as
expected.
Yes Go to step 3.
No Go to Keyboard: Specic
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 eect.
Yes Go to step 4.
No Go to step 5.
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