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#HOW TO REPAIR MAC PRO POWER SUPPLY HOW TO#
#HOW TO REPAIR MAC PRO POWER SUPPLY INSTALL#
#HOW TO REPAIR MAC PRO POWER SUPPLY VERIFICATION#

Reset the logic board to see if this resolves this problem.įans run at high speed (computer may shut down or may just hang and not shut down as a result)

If all fans seem to have failed, the problem is most likely not the fans. Verify all other fans are working properly.Reseat the processors and check for bent pins.Troubleshoot further if any LEDs indicate any failure.

#HOW TO REPAIR MAC PRO POWER SUPPLY HOW TO#

Refer to "Diagnostic LEDs" in this chapter for more information on how to locate and interpret these LEDs.

Open the side access panel and observe all diagnostic LEDs.

Power-on LED illuminates, fans spin up, no boot tone, and the system shuts down within a few minutes Power-on LED does not illuminate when power button is pressed, but fans spin, boot tone chimes, and there is video

Reset PRAM (restart computer while holding down Command-Option-P-R keys until second boot tone chimes).

Check video card connector and display cable for any bent pins.

Verify display is properly connected and powered on.

Power-on LED illuminates when power button is pressed, fans spin, and boot tone chimes, but there is no video If the Error LED follows the processor to the other processor location, replace that processor.

If only one of the CPU Error LEDs (LED 3 or 4) comes on, try swapping the processors.

Check diagnostic LED 3 and/or LED 4 for processor connection.

Power-on LED illuminates when power button is pressed and fans spin continuously but there is no boot tone or video

Reseat processors and check for bent pins.

Check diagnostic LED 3 and/or LED 4 for processor connection.

Refer to "Resetting the Logic Board" in this chapter. (Make sure video card is fully inserted in connector and end of card is secured by the connector latch.) For video cards that require power cables, check that they are connected. Power-on LED illuminates when power button is pressed but fans do not spin (or spin only momentarily) and there is no boot tone or video

Verify that the processor mounting clamps are properly tightened.

Verify that the processors are properly seated.

#HOW TO REPAIR MAC PRO POWER SUPPLY VERIFICATION#

If verification fails, replace power supply. Refer to "Power Supply Verification" in this chapter. Check diagnostic LED 2 for trickle voltage from the power supply.Power-on LED illuminates when pressed in, but goes out when button is released, there is no boot tone or video, but you can hear a small click Remove the installed front panel board and test with a known-good front panel board. Test whether the front panel board or power button is at fault.Verify that processors' mounting clamps are properly tightened.

Verify that processors are properly seated.Verify power supply cables are fully connected.Check that diagnostic LED 2 is on when the power cord is connected.Power-on LED does not illuminate when power button is pressed, fans do not spin, and there is no boot tone or video Important: For troubleshooting purposes, Mac Pro (Early 2008) computers may be started up and diagnosed with a single processor installed in either the upper (CPU A) or lower ( CPU B) position.

#HOW TO REPAIR MAC PRO POWER SUPPLY INSTALL#

For information on how to correctly install DIMMs, see the " Memory (DIMMs)" topic in the Take Apart chapter. Incorrect installation of DIMMs or incompatible memory will not allow the system to start up correctly. Note: Be sure to check the "Memory" and "Power-On Self Test" topics in the General Information section of this chapter. When testing a computer for the following symptoms, remove the side access panel so you can better observe or listen for fan movement.