The only dual core G5 CPUs were used in the very last series of Power Mac G5, offered in single processor 2 and 2.3GHz, as well as the dual processor "quad 2.5GHz". The mid 2004 PowerMac G5s used dual single core processors, offered as dual 1.8, dual 2.0, and dual 2.5GHz (a single processor 1.8GHz model was offered starting later that year). I've heard of dual processor PMG5s running on only one processor before. Has the OP tried running AHT or ASD yet?
-Adam 
 

Adam Vaughn
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On 06/22/13, Kris Tilford<[email protected]> wrote:
 
I'm not positive of this, but I'm about 95% sure your problem is different than you think.
These G5 PowerMacs came in two distinct configurations that both used the term "dual".

There were earlier versions with one dual-core CPU, and later versions with two single-core CPUs, and BOTH these are referred to by Apple a "dual". I believe your earlier 2004 PowerMac G5 has one dual-core CPU rather than two single-core CPUs.

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