Need advice Imac G5 Intel Duo 2 Core 2ghz will not power up DEAD

Hi all. Hoping for some friendly advice. I have an Imac G" Intel Duo 2 Core about a year old or so. My adult son was using it. Never a single issue and a very mild user. He reformatted it the other night and turned it over to me because he got a new one. I'm thrilled since I'm still using my G4 733 I've been faithfully keeping in operation since April 2001 with almost no issues. The only thing I have done is allow it to auto update everything the night before last. It's set to sleep the screen after an hour and the whole thing about 2 hours. Been working fine and just touch the keyboard and back to life.
Well this afternoon went back to take some more tutorials and it's just dead. As if it had gone to sleep but no amount of button pressing helped. Unplugged everything on USB, firewire. Using apple bluetooth KB and mouse that came with it. Both had new batteries as of other night. Left power cable loose for 10-15 minutes and no help. Held the single power button for long periods, tried holding it while plugging in to wall, tried other wall outlets. Wiggled chord to see if flakey... read articles on resetting some macs but nothing helped so far.
Thanks
LB

Well update I did finally get it to come on after a couple hours of coming back and fiddling. In efforts to fix it I looked up the number on the stand and it looks to be made mid 2007 which means likely no warranty.
I popped out the memory under the little bottom edge cover and dusted off some of the woolies. Didn't help but I blew into the round fan vent on the rear and a good bit of dust even came out the top edge vent. Looks like my son gathered some dust in this thing.
Still thought it would not come on but pressed again and suddenly it's ON and working but the cooling fan seems to be stuck on fast mode. I can't see any way this thing is having heat problems in my office which is a little warm but not hot.
So likely will take into service to clean and dust it out etc and maybe this fan will begin running right. This iMac has never given one ounce of trouble either. I'm posting this using the iMac
Any additional advice appreciated,

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Need advice Imac G5 Intel Duo 2 Core 2ghz will not power up DEAD

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