Help!!! G5 won't start up AT ALL!

I left this morning and the G5 was on. When I came back it was off (no one except me lives here). The power button won't start it. I checked the plug, checked the power, and other devices on the strip are working--is there some fuse that can be reset to make it start again?
I have a very big job that needs to be done right now! What could be wrong?

Try resetting the PMU or SMU, depending on your Power Mac G5 model.
http://docs.info.apple.com/article.html?artnum=86760 <- earlier models
<a class="jive-link-external-small" href="http://">http://docs.info.apple.com/article.html?artnum=300341 <- later models

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