Replaced power supply, G5 still dead - now what?

I recently posted that my wife's G5 2.0 (June 2004) had made a loud pop followed by a burning odor, and the consensus on the forum seemed to be that the power source had died. I just replaced the power source, but when I tried to fire up the computer got no results; no light, no chime, nothing. The one thing that the computer IS doing now that it did not after the "popping" incident is that when I turn on the power strip that the computer plugs into, the computer makes a small clicking sound, like a switch being flipped, that it also made before (but not after) the popping incident.
Before taking everything apart and looking to see where I might have screwed up I'd appreciate any advice as to where I should look first. I thought the disassembly and reassembly went pretty smoothly, so I'm a bit bummed at the lack of a positive result (except for the clicking noise being back).
Probably not relevant, but I was interested to see that the power source I pulled from the computer was made by Lite On, so perhaps it had been replaced before I bought it 4 years ago.

So here's where I am now. I disassembled the computer to the point of pulling the heat sinks so I could see the connections to the power supply, except for the plug that sits under the supply and would require pulling the PS out to check. All connections look good. I also looked at the connections from the "start button" back to the boards, and they looked/felt solid.
I did find the SMU reset button that BDAqua mentioned, and that I hadn't found before. I put the good battery out of my own computer in, pushed the SMU reset button, then plugged in and tried to start. No success; no light or any sound when pushing the startup button.
Any ideas what to try next? Could something else have fried when the power supply went? Or could the original popping noise and burning smell been caused by something else entirely? Do I need to pull the power source to make sure the final connection is good? I sure THOUGHT I plugged it together well.
On the positive side, I've gotten really fast at taking the computer apart....

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Replaced power supply, G5 still dead - now what?

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