User Guide

iMac (27-inch, Late 2009) Symptom Charts — Mechanical 101
2009-12-16
Verify if any tape, gasket, cable 3.
label, or cable is touching
the fan blades and causing a
ticking noise
Yes Secure the material so it
doesn’t touch fan blades. If
tape adhesive has lost its
stickiness, replace that section
of tape
No Go to step 4.
Remove fans and rotate blades. 4.
Check for any dust that could
be clogging the fans. Verify
if fan blades spin smoothly
without interference from fan
housing and fan blades are all
intact.
Yes Go to step 5.
No Replace aected fan(s). P06
Run Apple Service Diagnostics 5.
stand-alone tests in looping
mode, and verify if all sensor or
fans related tests pass.
Yes Noise issue resolved.
No Check for correct sensors/fans
connections on logic board.
Check for pinched cables.
Compare with known-good
similar system, and check
for unlisted sensors. Replace
aected sensor/fan.
P06
Stand/Hinge Issues
Symptoms Quick Check
Stand/Hinge Issues
Bent stand•
Broken hinge•
Stripped screw/head•
Stripped screw boss•
Unable to install VESA mount (if •
supported on this model)
Determine whether damage caused by user /1.
technician environment, accidental damage, or
abuse. If so, inform user/technician the failures
are not covered by Apple warranties. Refer to
http://www.apple.com/legal/warranty
For hinge noise issues replace hinge mechanism.2.
For information on selecting the adequate iMac 3.
VESA Mount Adapter and which computer
models are supported, refer to installation
manuals available at http://support.apple.com/
manuals/#desktopcomputers