IMac G5 won't power up...HELP!!

So I've just moved and my iMac(purchased Nov. 04) won't turn on. I've had this problem before when I installed and Airport Extreme card a few weeks ago, but it turned on after a few hours. Now it has been a few days. At first I had everything plugged into it, I've unplugged that all except the keyboard/mouse. The surge protector is working fine and the outlet it is in is working. Any thoughts on what I can do to get it to work? Or will I have to spend Sunday at the Genious Bar? Thanks alot.
Dave
p.s. Is that what the genious bar is for, taking in broken equipment? cuz I never really understood that. I'm assuming it doesn't cost anything for me to take it to them, but if it's the power supply then of course I'll have to pay for repairs.

So I'm having the same problem. It happened once when I woke it up from sleep, the power shutdown by itself. I couln't turn it on at all. I opened the back and put it back on without doing anything else, then it turned on. After 2 days, the same thing happened. So I read about that extended warranty and brought it to a sevice provider. I am covered by that warranty and looking forward to getting it fixed. I was glad that it failed before my 2 years is up, I think this fall is my 2 years. It's been in the shop for 3 days now and I hear the bad news. They say that they couldn't duplicate the problem, so I would have to pay for the 94 dollars that they will charge me for labor. They will be observing my computer till the end of the day then I'll pick it up. I'm crossing my fingers that it fails so I don't have to pay them and that they charge Apple for it. Any suggestions on what I should do if they don't find a prblem and if it breaks again on me.

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