System information

Mac mini (Mid 2011) Symptom Charts — Startup and Power 23
2011-07-21
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 antenna and
remove shield, disconnect
and remove fan and cowling,
then disconnect the following
cables from logic board before
being able to extract it :internal
drive(s) ex cable(s), 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
Apple Technical article http://
support.apple.com/kb/
HT3250 for details on using a
digital multi-meter.
M20
No Go to step 6.
6. Disconnect power button
connector from logic board and
short the two power button
connector pins on logic board.
Verify if the unit powers on.
Yes Replace Power Button
assembly
X03
No Go to step 7
7. Disconnect AirPort/Bluetooth
card ex cable, internal drive(s)
ex cable(s), and LED/IR cable
from logic board. Reconnect
AC power cord and press the
power button to verify if a
startup error tone is heard.
Yes Reconnect one by one each
device and retest to identify
the shorting one. When
found, replace aected device
cable rst, and retest.
X03
No Go to step 8