Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 33)

Mac mini (Late 2009) Symptom Charts — Startup and Power 33 2009-11-03
Reinstall fan while carefully 6.
ensuring that the cable is
routed properly and there’s
no interference with the fan
blades. After reassembling
system verify that the noise
issue is resolved.
Yes Noise issue resolved. Suspect
issue cause by interference
from wiring or possible
distortion or fan housing
when installed in system.
Proper reassembly resolved
issue.
P04
No Go to step 7.
Disconnect these major 7.
modules/parts (e.g: hard drive,
optical drive, fan) one at a time
then power ON the system.
Determine if noise issue goes
away when one of the modules
is disconnected.
Yes Identify, inspect, and if
necessary replace the part
that caused the noise to
disappear when it was
disconnected from the
system.
P04
No All parts verified. Verify that
the correct symptom flow is
being used.