Power Mac G4 (APG Graphics) won't turn on

Hi,
My Power Mac G4 (APG Graphics) won't turn on at all. This is not the first time, it also happened a little over a year ago and after about 9 months I plugged it in and it worked fine for almost six months. Each time there had been what could be considered "trauma," the first time we had moved about 400 miles and although it rode in the car with me, there was a lot stuffed in with us so it wasn't as gentle a ride as I'd hoped. This time we had an ice storm and I was actually using it when some power surges took place. It was plugged into a surge protector and everything else that was plugged in works fine.
When I press the power button, nothing happens. No chime, no light, nothing. I've pressed the PMU button and replaced the battery. I've switched to a different power cable. I've removed each of the RAM sticks and tried starting it while each was removed and after reinstallation. I've disconnected all peripherals. I'm stumped!
Any suggestions would be greatly appreciated!

I followed the procedure I found through other discussions, but when I went to the link that was suggested in the previous post I found that I did one thing wrong. When resetting the PMU didn't work the first time, I continued to press it after each subsequent attempt. So after changing the battery, I pressed the PMU. After checking the RAM, I pressed the PMU, etc. According to the directions in the link, pressing the PMU more than once could wreck it completely. Does anyone know how to tell if I've done that or if I can do something else now? Thanks.

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