Mac Pro (Mid 2010) Symptom Charts — Intermittent Shutdown 46
2010-08-31
Deep Dive
Check Result Action Code
1. Verify shutdown/restart/
sleep issue does not occur
with a known good AC
Mains power source. Rule out
customer environment such
as defective, uninterruptable
power supplies. Rule out
power generators which may
produce noisy power, straining
the computer’s internal power
supply and causing issues.
Yes Suspect unstable AC Mains
power source. Using an
alternate AC Mains power
source resolves issue.
No Go to step 2
2. Remove all non critical internal
and external peripherals, i.e.
AirPort, Bluetooth, PCIe cards,
external USB drives etc. Verify
shutdown/restart/sleep issue
does not occur
Yes Shutdown/restart/sleep issue
does not occur when internal
and external peripherals
removed. Troubleshoot
suspected peripherals.
No Go to step 3
3. Verify if fans are running fast. Yes Go to “Fast/Failed Fans” Flow
No Fans running at normal speed.
Go to step 4.
4. Reset SMC. Verify computer
functions correctly and does
not intermittently shutdown/
restart/sleep.
Yes Corrupt SMC State causing
power stability issues.
Resetting SMC has resolved
the issue.
No Go to step 5
5. Attempt to boot from original
or compatible install media, or
from a known good external
hard drive with compatible OS
X installed.
Verify computer stays ON
without any intermittent
shutdown/restart/sleep.
Yes Computer power remains
stable and does not
intermittently shutdown/
restart/sleep. Clean install
customer HD with compatible
OS. Perform all Software
Updates if required.
No Go to step 5
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