Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 66)

Mac mini (Late 2009) Symptom Charts — Input/Output Devices 66 2009-11-03
Verify whether customer 3.
reported audio issue has been
resolved.
Yes Issue no longer present.
Return system to customer.
No Go to step 4.
Boot system from Install DVD or 4.
another known good bootable
volume. Verify whether issue
still occurs.
Yes Go to step 5.
No Known good boot volume
works OK. Troubleshoot
for software issue. Isolate
whether issue is application
specific or whether possible
operating system conflict.
Make sure user data backed
up before removing or
reinstalling software.
Connect external speakers 5.
to Headphone Out port
and set System Preferences
Sound/Output to external
speakers, then play a sound
file. Verify that sound quality is
acceptable.
Yes Audio board, internal speaker,
and external headphone port
functioning correctly. Return
system to user.
No Go to step 6
Disconnect and carefully 6.
inspect flexible cable and
connectors connecting audio
board to logic board for
damage such as bent pins or
pinched/cut wires.
Yes Replace damaged part(s)
then retest. Return to step
1 if problem continues to
verify whether symptom has
changed.
M09
No Replace audio board then
retest.
M09