Mac pro 2008 wont turn on

Oct 27, 6: Does your small white power light above the on button at flash on, then off? My tower also would not start. It turned out to be a bad memory module. Mac Pro Tower wont turn on.

Mac Pro won't boot

How to trouble shoot power supply More Less. Communities Contact Support. Sign in. Browse Search. Ask a question.

User profile for user: Desktops Speciality level out of ten: I shut it down during a storm because of power glitches, the next day it would not start. Pressing the Diag Switch on the Main Board give a yellow led, showing stand by power is there. Holding the Start Button down and pressing the Diag Switch gives no lights. Pressing the switch right below the Diag Switch give 2 red leds when the switch is released. Am I correct that the lower switch resets the SMU?

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Very strange. Also, when I do manage to get the MP to power up, when I use the sleep option, it powers down again. Maybe time to replace that power supply? I have the same issue. Took it in to test it, all components work and tested fine, even the power supply.

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Logic board is the only thing left. Anyone has resolved this issue. Any help appreciated. Power Supply most likely culprit. It will work like you describe, and then fail for no reason.

Early Mac Pro won't power up | Mac Forums

Have you opened the Mac Pro and given it a good clean out lately? Using OS X. Originally Posted by kevvo. I have the same issues, have replaced, or tested replacing psu heat syncs both cpus and finally the logic board. Resolved it for 3 months, then the same thing happened.

3. Perform the special power cycle

There's something chronically wrong with a percentage of this era of machine from a manufacturing standpoint. Macbook Pro 15" early won't start black screen, but fans works By audun in forum Apple Notebooks. If it fails with no RAM - start with the Express Lane or your hardware tech of choice since the logic board isn't working well enough to even see the RAM that you have installed. Most of the time, it's a bad stick of RAM or just needing you to re-seat the RAM, but update your question with the results of this test and the causes will be narrowed down from the several things that can cause this boot failure condition.

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My mac pro doesn't want to start up. Any idea what might be going on?

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