Mac Pro (Mid 2010) Symptom Charts — No Power/Dead Unit 42
2010-08-31
Startup and Power Issues
Follow the steps in the order indicated below. If an action resolves the issue, retest the
computer to verify. If the issue persists after retesting, return to step 1.
No Power/Dead Unit
Unlikely cause: Optical drive(s), hard drive(s), fans, memory, processors, PCIe cards, speaker,
AirPort card, Bluetooth card
Quick Check
Symptoms Quick Check
No Power/Dead Unit
No power
No front panel power/sleep LED
No startup chime
No Image on external display
No HD
No fans spin
No light if Caps Lock pressed
Non-operational
Reseat all DIMMs. Refer to Memory Diagnostic LEDs.
Verify power source.
Verify power cable.
Reset SMC by unplugging the AC power cord for 15
seconds. Reconnect the power cord without pressing
the power button. After 5 seconds press the power
button and verify that the the computer turns on.
Reset RTC.
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