iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices 108
2010-09-09
Keyboard: Specic Keys Do Not Respond
Quick Check
Symptoms Quick Check
Keyboard: Specic Keys Do Not
Respond
• One or more keys do not
respond when pressed
• Key sticks
• Keycap missing
1. If wireless keyboard is being used verify that it is
properly paired with computer. Go to Wireless
Input Device Doesn’t Pair symptom ow to
resolve pairing issues.
2. The caps lock key has a built-in delay to reduce
accidental activation and must be held for
approximately ½ second for it to be activated. See
kBase #TS1578: Apple Keyboard (2007): Caps
Lock modied to reduce accidental activation.
3. Inspect keyboard for signs of liquid spills or other
contamination. Apple’s warranty does not cover
accidental damage.
4. If keycap is loose attempt to reattach it.
5. Use the Keyboard Viewer menu to check every
key.
6. Recheck keyboard with a known-good computer
with an up-to-date Mac OS X 10.6.x
7. Replace keyboard if issue is conrmed (K01 for
inoperative keys, K17 for wrong/falling keycaps).
Wired Keyboard/Mouse Not Recognized
Quick Check
Symptoms Quick Check
Wired Keyboard/Mouse Not
Recognized
• USB wired keyboard/mouse not
recognized when plugged in.
• Mouse scroll ball not working
or not working as expected.
• Mouse buttons not working or
not working as expected.
1. Reset SMC.
2. The iMac has 4 USB ports on rear of computer.
Make sure to try each port to isolate a particular
port malfunction.
3. Test with a known-good wired keyboard or
mouse to isolate a failed peripheral issue.
4. Test a mouse when connected directly to ports
on the back of iMac to isolate a keyboard USB
port issue.
5. Ensure that all software and rmware updates for
this model have been installed to take advantage
of any available bug xes.