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Please send a tutorial on how to replace the PRAM battery in a G5 dual mac. I cannot find one anywhere.

The PRAM battery on your machine is located under the RAM slots at the bottom of your logic board. You may have to remove the bottom DIMM to see it. Here is the Service Source PDF for your machine. (I would save this file for future reference). See page #50: http://www.scribd.com/doc/67281472/21536