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Apple Computing Products:
macOS - Desktop Hardware
Early 2008 Mac Pro won't power up
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<blockquote data-quote="kevvo" data-source="post: 1115204" data-attributes="member: 173378"><p>I have a Mac Pro from mid 2008. Recently, it has done the following:</p><p></p><p>Also, it will now sometimes just power off completely without warning. </p><p></p><p>Problem 1: In the morning when I turn it on, on some occasions it will power on for 5 or so seconds, then power right back off again. Sometimes this happens after 5, 10 or even 20 seconds (right in the middle of OS X or Windows boot). This can sometimes happen 10 or 20 times in a row before it will eventually turn on and function normally. </p><p></p><p>Problem 2: Random power cut off, sometimes at idle, sometimes while browsing, or using any other app. I can't pin it on any one particular function. I know it's not a temperature problem, I have temp monitors on my menu bar and as far as I can see it's been fairly stable in that regard. Most of the time, I can power up the computer again but very occasionally it will revert to what I described in problem 1.</p><p></p><p>I had it checked out by an engineer who got it running, and ran diagnostic tests on a loop. No problem. Then took it home and problem 1 re-occurs! </p><p></p><p>One further piece of info, boots up fine if I remove the power cord overnight.</p><p></p><p>Any advice, or others who have had this problem would be much appreciated.</p></blockquote><p></p>
[QUOTE="kevvo, post: 1115204, member: 173378"] I have a Mac Pro from mid 2008. Recently, it has done the following: Also, it will now sometimes just power off completely without warning. Problem 1: In the morning when I turn it on, on some occasions it will power on for 5 or so seconds, then power right back off again. Sometimes this happens after 5, 10 or even 20 seconds (right in the middle of OS X or Windows boot). This can sometimes happen 10 or 20 times in a row before it will eventually turn on and function normally. Problem 2: Random power cut off, sometimes at idle, sometimes while browsing, or using any other app. I can't pin it on any one particular function. I know it's not a temperature problem, I have temp monitors on my menu bar and as far as I can see it's been fairly stable in that regard. Most of the time, I can power up the computer again but very occasionally it will revert to what I described in problem 1. I had it checked out by an engineer who got it running, and ran diagnostic tests on a loop. No problem. Then took it home and problem 1 re-occurs! One further piece of info, boots up fine if I remove the power cord overnight. Any advice, or others who have had this problem would be much appreciated. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Early 2008 Mac Pro won't power up
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