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User profile for user: Soufiane_K
Soufiane_K Author
User level: Level 1
4 points

2009 Mac Pro Power Button won't turn on

i have mac pro early 2009 a1289, It will not power on when I press the power button.

  • I have tried to reset the SMC using the Control+Option+Shift and Power button but no luck.
  • I have also tried the "Hold Power Button 10 Seconds then release and press again to power on" but no luck.
  • I have also tried unplugging the power for 15 Seconds and then plugging the power back in and leaving for 5 Seconds but still nothing.
  • When I press the Diag button on the motherboard I get an orange light on the 5V Standby.
  • When I unplug the mains power and plug it back in, no matter what time interval I get 2 red lights on the Over Temp CPU A and CPU B but they immediately turn off.

i can't résolve the problem ! help me please


Posted on Nov 2, 2021 8:03 AM

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
133,333 points

Posted on Nov 2, 2021 8:17 AM

Measure the Voltage on the PRAM backup battery, a long life non-recharging coin cell half-hidden behind the graphics card. Use a bright light to understand the battery holder fully before acting -- breaking the battery holder will ruin your afternoon.


That battery needs to be above 3.0 Volts for your Mac to start. CR2032 used in car-key fobs and garage door opener controls is a pretty good substitute.

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
133,333 points

Nov 2, 2021 8:17 AM in response to Soufiane_K

Measure the Voltage on the PRAM backup battery, a long life non-recharging coin cell half-hidden behind the graphics card. Use a bright light to understand the battery holder fully before acting -- breaking the battery holder will ruin your afternoon.


That battery needs to be above 3.0 Volts for your Mac to start. CR2032 used in car-key fobs and garage door opener controls is a pretty good substitute.

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2009 Mac Pro Power Button won't turn on

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