IBook won't start - serious problem

My G4 iBook is in some serious trouble.
While I was working, my iBook suddenly shut down, and I couldn't reboot it since.
Whenever I try to press the power button, I can hear the fan for a split second, before it turns down by itself.
I am not sure if the motherboard died, or the power system has failed.
Please help. Thanks.

Welcome to Apple Discussions
Do you have Apple Care? This situation would be covered under warranty.
Do you live near any of the Apple Stores in the Toronto area? If you're not sure, go to the Apple main web page to locate stores in your area. At the bottom left of the page, click on the drop down menu to search for Apple stores. Near the bottom of the list you'll see the Toronto locations. From what you describe, It sounds like a power supply failure. Someone at the Genius Bar (you need to make an appointment in advance) can assist you.
Otherwise, bring the machine to a nearby certified Apple tech.

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