20" 1.8 G5 iMac troubleshooting help

[robla64]

I picked up a 20" G5 1.8 iMac recently and need some help troubleshooting.

I have got it to chime and boot once and a while. I was even able to boot it in firewire mode so I could update to 10.5.

However, most of the time it will not chime, and the fans will blow on high after about one minute. I have swapped out the ram and power supply and get the same results. The caps look great, not even the slightest of bulges.
LED 1 and 2 come on consistently and 3 only comes on when it decides to boot.
The fan from the processor dosen't blow very hard, so is it possible the processor is damaged?

Thanks in advance for any tips or advice.

 

[adcx64]

Try zapping the PRAM & NVRAM, do a quick google search for how to do that

 

[robla64]

Tried restiing and it still has the same symptoms.... it only seems to chime once every 10 or more tries. It seems to chime when it has been left alone for a few hours.
Any other ideas?

 

[adcx64]

Make sure the power button is properly connected to the logic board, also, give it a good cleaning. Hope it helps