G5 won't power on but light is stuck on!

Hi
Today the power in my flat was turned off at the mains after there was a flood in my buildinbg - this happened while my G5 was on. When the power came back on at the mains, I found that the G5 white power light was on at the front, but nothing else happens.
Holding the power button doesn't turn the G5 on or off. It is just stuck with the power light on.
What has happened? Did the mains tripping off blow a fuse or something inside the G5 or is there something I can do to get it to reset? Or is it something worse?
Thanks for your help.

This is truly strange. I'm having the exact same problem. Last night we had a huge lightening storm here, and I powered down the computer, turned off the battery backup, and pulled the plug on the battery backup from the wall socket. After the storm, I reconnected and have exactly the same problem - power light constantly on, but the computer won't power up.
I was looking to start my own thread, but saw this and I guess it makes more sense to join in here. The only difference in artificedesign66's story and mine is that there was no sudden loss of power, everything was shutdown properly. It seemed to be running fine until that point, and did have an APC battery backup/surge protector in place for what that's worth.
I unplugged and replugged a few times last night. When that didn't work, I disconnected everything from the computer (monitor, all usb and firewire, power) and left it that way overnight. This morning I reconnected only the monitor, keyboard/mouse, and power, but still no go.
I do use a third party keyboard that lacks the power button - I use the one on the face of the cpu. Is there any value in digging the apple keyboard out of the basement to try that?
Thanks all for any help and to artificedesign66 for sharing the thread - hope you don't mind.

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G5 won't power on but light is stuck on!

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