PPC G5 quad will not start up after resetting SMU AND PRAM

Hi folks
I been having issues with my G5, where it would freeze up unexpectedly and then the fans would come on full tilt.
I received some advice about resetting the SMU and the PRAM.
Now my mac dose not get past the grey screen. I have to hard drives attaches one has OS 10.4.11 the other has Leopard.
Odd thing about the Pram is I never got the mac to re-chime.
Also I was advised at the apple store to disconnect power for 30 sec and then hold the power button on for 20 sec after the restarting. I heard an odd tone and then the fans came on.
Btw this model does have the SMU button which I pressed when the power was off.
As the unit will not run with the fans removed.
Any suggestions?
Much appreciated
12 gig of ram in the 8 slots. All FireWire , Ethernet and USB disconnected

There is a battery that makes the PRAM work. You may need to replace the battery.
You may also need to limit your RAM to two 1 GB modules, making sure they are made for the PowerMac G5 of your machine's age. Not all 533 MHz PC2-4200 DDR2 SDRAM. will work with the machine, it has to be specifically made by the age of the Mac model, and Mac model name according to the vendor. Thus if you have a Quad Core Mac from 2005, that's what you need to buy RAM for. Do not buy 533 Mhz PC2-4200 RAM just because it says it is that.
http://www.crucial.com/ and http://www.macsales.com/ specify the model and age of Mac in their store.
Others may too, but do not have ValueRAM or non-lifetime warranty RAM.
Lastly, your model may have liquid coolent that has run out or gotten old, making it not boot. If unsure where it is, ask an authorized service center. Some have leaks and won't boot at all.

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PPC G5 quad will not start up after resetting SMU AND PRAM

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