1 From the Apple menu, choose Shut Down (or if the computer is not
responding, hold the power button until it turns off).
2 Unplug all cables from the computer, including the power cord and any
display cables.
3 Wait at least 2 minutes.
4 Plug the power cord back in, making sure you are not pressing the power
button at the same time. Then reconnect the keyboard and mouse to the
computer.
5 Press the power button to start up the computer
System Reset
Mac Pro has a system reset switch on the logic board that you may use to
restart the system while it is powered up. You can use this switch to determine
if a computer that won’t consistently boot from a cold start has power supply
issues. Follow these steps to reset the system:
1 Start up the computer.
2 With a nylon probe tool, press the system reset switch located in the upper
right-hand corner of the logic board.
If the computer boots after you press the system reset switch, try shutting off
the computer and restarting by pressing the front power button. If the computer
restarts when you press the system reset switch but not from a cold start, the
-
power supply may need to be replaced.Let us know if you get any changes, also look at the diagnostic LEDs and tell us what you observe. https://www.ifixit.com/Guide/Mac+Pro+First+Generation+Power+Supply+Unit+Replacement/32222
+
power supply may need to be replaced.Let us know if you get any changes, also look at the diagnostic LEDs and tell us what you observe. [guide|32222]
1 From the Apple menu, choose Shut Down (or if the computer is not
responding, hold the power button until it turns off).
2 Unplug all cables from the computer, including the power cord and any
display cables.
3 Wait at least 2 minutes.
4 Plug the power cord back in, making sure you are not pressing the power
button at the same time. Then reconnect the keyboard and mouse to the
computer.
5 Press the power button to start up the computer
System Reset
Mac Pro has a system reset switch on the logic board that you may use to
restart the system while it is powered up. You can use this switch to determine
if a computer that won’t consistently boot from a cold start has power supply
issues. Follow these steps to reset the system:
1 Start up the computer.
2 With a nylon probe tool, press the system reset switch located in the upper
right-hand corner of the logic board.
If the computer boots after you press the system reset switch, try shutting off
the computer and restarting by pressing the front power button. If the computer
restarts when you press the system reset switch but not from a cold start, the
-
power supply may need to be replaced.Let us know if you get any changes, also look at the diagnostic LEDs and tell us what you observe.
+
power supply may need to be replaced.Let us know if you get any changes, also look at the diagnostic LEDs and tell us what you observe. https://www.ifixit.com/Guide/Mac+Pro+First+Generation+Power+Supply+Unit+Replacement/32222
To reset the SMC on a Mac Pro:
1 From the Apple menu, choose Shut Down (or if the computer is not
responding, hold the power button until it turns off).
2 Unplug all cables from the computer, including the power cord and any
display cables.
3 Wait at least 2 minutes.
4 Plug the power cord back in, making sure you are not pressing the power
button at the same time. Then reconnect the keyboard and mouse to the
computer.
5 Press the power button to start up the computer
System Reset
Mac Pro has a system reset switch on the logic board that you may use to
restart the system while it is powered up. You can use this switch to determine
if a computer that won’t consistently boot from a cold start has power supply
issues. Follow these steps to reset the system:
1 Start up the computer.
2 With a nylon probe tool, press the system reset switch located in the upper
right-hand corner of the logic board.
If the computer boots after you press the system reset switch, try shutting off
the computer and restarting by pressing the front power button. If the computer
restarts when you press the system reset switch but not from a cold start, the
power supply may need to be replaced.