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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Mac Pro won't turn over


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slubig

 
Member Since: Mar 06, 2011
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My 2006 Mac Pro 1,1, won't turnover on power on. CPUa/b overtemp lights illuminated on logic board along with only trickle power. No other diagnostic lights turn on including power on, which leads me to suspect I have a PSU malfunction.

I posted a YouTube video of the problem:

YouTube - Mac Pro 2006 Boot Issue

I'd appreciate any feedback!
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chscag

 
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Nice video explanation. I wish everyone would do that - makes it a lot easier to offer assistance.

I'm no expert when it comes to a Mac Pro but it does seem like your PSU has problems. I'm not sure where you can buy a new power supply for your Mac Pro but the first place to try is the folks at ifixit. iFixit: The free repair manual If they don't have one in stock try Powerbook Medic.

I believe both resellers allow returns if it should turn out to be something else.
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BrianLachoreVPI

 
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I know jack diddly squat about Mac Pros - although it's a beautiful machine. I will say, however, that I had several PSUs go on me back when I had windows machines - happens all the time. Did you check with a simple voltmeter to see if you're getting the expected voltages from the PSU? Again - I don't know about Mac Pros specifically - but my old Windows boxes I could just pull the PSU - and check for the expected voltages. I would imagine you could do the same in this case to validate your concern - just as a next step?
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slubig

 
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I'm really hoping it's the PSU. I have it apart at the moment looking for any blown fuses and capacitors. I do have a multimeter but am at a bit of a loss of how to test. Any suggestions?
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Did you do a PRAM reset as described here? Apple - Support - Discussions - Mac pro won't boot ...

Regarding testing for voltages - I don't know enough about which voltages that PSU provides and on what pins to help. If you don't find the voltages - that's very telling - however, if you do, it still doesn't rule out the PSU as you may have the PSU shutting itself down under load.
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PSU from your description and should set you back about $500 at an Apple reseller or do it yourself much cheaper. My Mac Pro sat in a storage container in LA prior to shipping to Australia for two years and the PSU had to be replaced. Here is one who supply the unit and instructions:-


http://www.mac-pro.com/s.nl/it.A/id.5316/.f

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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