IMac turns off after it turns on

Quick question on what might be a problem with an iMac G3 350Mhz. I hit the power button, the green light comes on, the hard drive starts to spin, about 1 second, everything shuts off. Can't really figure out where I might start (Power supply, bad Power Switch). Works the same if I hit the power button on the front of the unit or on the keyboard.
Any suggestions?

I'm no whiz at this, but I have a suggestion: back-up any data you don't want to lose or you may be paying for a transfer sometime soon onto a new computer. Recently, my iMac G3, bought in 2000 and on its second HD, "popped" with a flash of light from the base when I turned it on. After that, my screen would appear an electric green color and then would shut down within a second, just like yours did. Turned out that my analog board blew and it would cost over $400-$500 to get it replaced. With a six year-old computer's potentially escalating problems at stake, I decided to buy a brand-spanking new iMac 5,2. Hated to spend all that $$$, but I'm enjoying it, especially since I got DSL, too!
If your problem is fixed with the PRAM battery, good for you; but still, back up your data.
iMac5,2 (17 inch monitor)   Mac OS X (10.4.7)   Previous computer: iMac G3 w/o Firewire. Analog board blew after 6 years.
iMac5,2 (17 inch monitor)   Mac OS X (10.4.7)   Previous computer: iMac G3 w/o Firewire. Analog board blew after 6 years.

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