On Dec 4, 2012, at 3:24 PM, Bruce Johnson wrote:

From the symptoms you describe, some of the caps on the mobo are bad.

Agreed, bad caps.
You can visually check for "popped" caps on the motherboard. Here's what popped caps look like:
<http://c.fixya.net/fixya20/uploads/Images/C2F85BA.jpg>

Here's disassembly instructions to get access:
<http://www.powerbookmedic.com/wordpress/2010/04/06/imac-g5-repair-guide-teardown-released >

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