IMac Dead - HELP!

Last night my Daughters 17" iMac froze on her and she shut it down by holding down the power button - since then it will not reboot.
When the power button is pressed I can hear the fan come on but the screen stays black and the keyboard will not respond - even the Caps and Number Lock lights don't work.
Applecare has long since expired and I'd like to avoid taking a 5 year old mac in for a $100 per hour service - is there anything I can try?
I tried resetting the PMU and removed the extra RAM in case that was an issue - no luck.
I can't even start it in Single User Mode!
As I said in the subject line...HELP!
Thanks,
David

Given the symptoms you describe (degraded display followed by loss of display and no power on the ports) I'd agree that the logic board has failed. Do you get a Power On Self Test result (beeps instead of start-up chime). Have a read of this user tip (link). 
Replacing the logic board is not easy. You'll need to find the logic board of the correct type at a reasonable price. You'll also need to find replacement thermal pads; which when I last looked were around $50. Without those pads the iMac will overheat. The thermal paste is easy to find for the top half of the dome.
mrtotes

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