iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power 38
2010-09-09
3. Wait 15 seconds after computer
was powered down then
disconnect AirPort cable from
logic board. Verify if computer
starts up properly now.
Yes Go to AirPort Card Kernel
Panic symptom ow.
No Go to step 4.
4. Startup with Alt key to select
and start from the Install DVD
inserted in the optical drive,
or from an external bootable
volume connected. Verify if
computer starts up properly
from alternate bootable
volume.
Yes Go to Hard Drive Not
Recognized symptom ow.
No Go to step 5.
5. Disconnect optical drive cable
and retest. Verify if computer
starts up properly now.
Yes Reconnect optical drive and
go to Optical Drive Not
Recognized symptom ow.
No Go to step 6.
6. Remove coin battery on back
of logic board (you will need
to completely remove logic
board to do this), and leave out
for approximately 1-2 minutes.
Then reinstall battery. This
will reset logic board. Verify if
computer starts up properly
now.
Yes Issue resolved by logic board
reset. Measure DC voltage on
battery touching battery with
red probe, and grounding
with black probe. If voltage is
2.7v or less, replace battery.
For multimeter help, see
kBase #HT3250: Diagnostics:
Using a digital multimeter.
No Replace logic board. M02