Over the weeks I have become intimately experienced with these imac g5's. Yes, the problem was the caps. I now have recapped a dozen of these imacs, with a tidy profit to boot. Very easy fix, especially if you use the "chipquick" product from Jim. I am now moving on to fixing intel iMacs, but they are a pain in the %^$ - too bad apple had to make them so un-user serviceable.