IMac G5 isight not booting, screen remains black & fans start

Hello,
The iMac in question is a 2.1 G5 20" screen with iSight. It has worked perfectly with no problems up until recently, now when I go to switch on the chime sounds, the screen remains black and after about a minute the fans startup.
I have attempted to reset the SMU and PRAM to no avail.
I did manage (after several attempts) to boot into Target Mode with another mac connected by Firewire. The hard drive shows up and all the files seem to be there. I scanned the drive with TectTool Pro and repaired permissions, I also used Disk Warrior to rebuild the drive. Still the problem persists.
Tried to boot from CD but so far this has been unsuccessfull.
I have read of people having similar problems but have yet to find a working solution but I'm hoping there is one out there as the iMac was working wonderfully right up until this problem!
Thanks in advance

It sounds as if your power supply is failingand/or your logic board. I think it's time to take it in and have it looked at. But before you do that, try running the Apple Hardware Test, on your install disc.

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Hi guys,
got the same problem. I've even talked to apple's 2nd level support about it.
made pictures for them and so on. Now the important questions!!!
Are you guys smokers ? I bet you are
Apple's 2nd level support told me that this is caused by smoking infront of the imac.
And their solution to this problem (at least here in germany) is to get it cleaned and tell you to stop smoking in front of it !!!!!!!!!!!!!!!!!!!!!!!!!
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I'm soooo **** !
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Smokers unit !
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IMac G5 isight not booting, screen remains black & fans start

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