Go Back   MacRumors Forums > Apple Hardware > Desktops > Mac Pro

Reply
 
Thread Tools Search this Thread Display Modes
Old Oct 29, 2011, 04:21 AM   #1
arobertson545
macrumors newbie
 
Join Date: Feb 2011
Mac Pro: Turns on and Then Turns Off

I have a Mac Pro 1,1 from 2006 and I am having a start up problem. When I start it up for the first time in the day (usually in the morning) the power light glows and then the computers shuts off, this then repeats. After it has done this about 5-10 times the computer successfully starts up. Once it has started up, it can be shut down and restarted without a problem and all the hardware works.

Any suggestions?
arobertson545 is offline   0 Reply With Quote
Old Oct 29, 2011, 06:42 PM   #2
nambuccaheadsau
macrumors regular
 
Join Date: Oct 2007
Location: Nambucca Heads Australia
You have a failing power supply. Pretty common in the 2006 model Mac Pro 1.1.
__________________
Quad Core 2.66GHz Mac Pro, 16GB RAM, OWC Mercury Electra SSD and Velociraptor drives, BenQ 22" LED and OS X.7.4.
nambuccaheadsau is offline   0 Reply With Quote
Old Oct 29, 2011, 08:14 PM   #3
nanofrog
macrumors G4
 
Join Date: May 2008
Quote:
Originally Posted by nambuccaheadsau View Post
You have a failing power supply. Pretty common in the 2006 model Mac Pro 1.1.
I'd say PSU as well.

Given it's age and description, the main supply capacitors are probably leaking/bulging, and don't work properly until they're up to temp.

If the OP is handy with a soldering iron and knows enough about electricity (particularly safety), they could replace them if a replacement PSU isn't available, or costs an arm + leg.
nanofrog is offline   0 Reply With Quote
Old Oct 30, 2011, 03:39 AM   #4
arobertson545
Thread Starter
macrumors newbie
 
Join Date: Feb 2011
I'll try and find a new PSU. Is it relatively easy to fit?
arobertson545 is offline   0 Reply With Quote
Old Oct 30, 2011, 02:29 PM   #5
nanofrog
macrumors G4
 
Join Date: May 2008
Quote:
Originally Posted by arobertson545 View Post
I'll try and find a new PSU. Is it relatively easy to fit?
It's not too difficult IMO.
nanofrog is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Desktops > Mac Pro

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Mac Pro turns itself on after shutdown Notawiz Mac Pro 13 Sep 5, 2014 02:42 PM
Macbook Pro 2010 A1286 ( Turns On & Turns Off ) Sparepartz MacBook Pro 1 Nov 22, 2013 08:38 PM
Can someone please help Mac pro turns but screen goes black after a while Zobec Mac Pro 8 Oct 1, 2013 02:50 PM
Early 2011MBP 13.3" Mac turns off as soon as it turns on anonymous12 MacBook Pro 1 Aug 5, 2013 03:12 AM
2009 Mac Pro won't turn on, turns off rondocap Mac Pro 6 Jul 8, 2012 10:20 PM

Forum Jump

All times are GMT -5. The time now is 08:51 AM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC