Apple MC408LL Apple Technician Guide - Page 19

Deep Dive, Check, Result, Action

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2010-08-03 Deep Dive Unlikely cause: speakers Check 1. Connect AC to computer and press the power button on system. Verify if there is any indication that the system has powered up (fan rotation, hard drive or optical drive noise, ...). 2. Reseat the installed SDRAM memory module(s) and retest. Does the computer start up properly now? 3. Replace installed SDRAM memory module(s) with known-good one. Does the computer start up properly now? 4. Remove bottom cover, disconnect AirPort antenna and remove shield, disconnect and remove fan and cowling, then disconnect the following cables from logic board before being able to extract it :HDD, ODD/HDD, Ambient sensor, HD sensor, ODD/HD sensor, IR/ LED cable. Check and reseat power button cable connection to logic board and verify if the unit powers on. 5. Remove the coin battery on the logic board, and leave out for approximately 1 minute. Then reinstall the battery. This will reset the logic board. Does the computer startup properly now? Result Yes Action The system is powering up. Jump to Won't Start Up symptom flow. No Go to step 2. Yes Badly seated SDRAM memory module. Reseating it resolved issue. No Go to step 3 Yes Replace defective user's SDRAM memory module. No Go to step 4 Yes Reseating the power button connector on logic board resolved the issue. No Go to step 5. Yes Issue resolved by logic board reset. Measure DC voltage on the battery touching the battery with the red probe, and grounding with the black probe. If voltage is 2.7v or less, replace the battery. See KBase article http://support.apple. com/kb/HT3250 for details on using a digital multi-meter. No Go to step 6. Code M20 Mac mini (Mid 2010) Symptom Charts - Startup and Power 19

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Mac mini (Mid 2010) Symptom Charts — Startup and Power
19
2010-08-03
Deep Dive
Unlikely cause: speakers
Check
Result
Action
Code
1.
Connect AC to computer and
press the power button on
system. Verify if there is any
indication that the system has
powered up (fan rotation, hard
drive or optical drive noise, ...).
Yes
The system is powering up.
Jump to
Won’t Start Up
symptom flow.
No
Go to step 2.
2.
Reseat the installed SDRAM
memory module(s) and retest.
Does the computer start up
properly now?
Yes
Badly seated SDRAM memory
module. Reseating it resolved
issue.
No
Go to step 3
3.
Replace installed SDRAM
memory module(s) with
known-good one. Does the
computer start up properly
now?
Yes
Replace defective user’s
SDRAM memory module.
No
Go to step 4
4.
Remove bottom cover,
disconnect AirPort antenna
and remove shield, disconnect
and remove fan and cowling,
then disconnect the following
cables from logic board before
being able to extract it :HDD,
ODD/HDD, Ambient sensor,
HD sensor, ODD/HD sensor, IR/
LED cable. Check and reseat
power button cable connection
to logic board and verify if the
unit powers on.
Yes
Reseating the power button
connector on logic board
resolved the issue.
No
Go to step 5.
5.
Remove the coin battery on
the logic board, and leave out
for approximately 1 minute.
Then reinstall the battery. This
will reset the logic board. Does
the computer startup properly
now?
Yes
Issue resolved by logic board
reset. Measure DC voltage
on the battery touching the
battery with the red probe,
and grounding with the black
probe. If voltage is 2.7v or less,
replace the battery. See KBase
article
com/kb/HT3250
for details
on using a digital multi-meter.
M20
No
Go to step 6.