iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power 42
2010-09-09
Deep Dive
Check Result Action Code
1. Activity related shutdowns:
Reset SMC and PRAM and
verify that shutdown issue still
happens.
Yes Check with known-good
bootable drive: go to step 2
No Shutdown cause was related
to SMC or PRAM programmed
shutdown settings or
corruption, and was resolved
by reverting them to default
settings.
2. Booting from known-good
bootable drive , verify that
shutdown issue still happens.
Yes Go to Power related
shutdowns on step 3
No Shutdown events do not
happen on known-good OS.
Reinstall Mac OS on customer
hard drive, update OS with
latest version and check if any
rmware update is available.
3. Power related shutdowns:
With known-good AC power
cord and AC outlet, Verify if
system continues to restart or
shutdown
Yes Go to step 4.
No AC power cord / outlet issue.
Issue resolved.
X03
4. Disconnect hard drive power
cable from hard drive and
startup the computer from
other bootable media (like
Install DVD, a same model
computer in Target Disk Mode,
or a compatible known-good
OS on an external drive). Verify
if system continues to restart or
shutdown.
Yes Go to step 5
No Possible bad software or hard
drive. Go to Hard Drive Not
Recognized symptom ow.
5. Inspect and reseat AC inlet
connection to power supply
(the smaller of the 2 cables
connected to power supply),
and DC power cable from
power supply to logic board.
Verify if damage is observed on
the cables or connectors.
Yes Replace damaged cable.
Retest. Return to step 1 if
problem continues.
X03
No Go to step 6.
6. Install known-good power
supply. Verify if system
continues to restart or
shutdown.
Yes Reinstall original power
supply. Go to step 7.
No Issue resolved with power
supply replacement.
P02