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BrianLachoreVPI

 
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Member Since: Feb 25, 2011
Location: Maryland
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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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