Power Mac G5 Dual 2.7GHz

I've had this G5 (2.7GHz, 1.5GB Apple RAM) since around February or March and for quite some time it made two clicking sounds and that was it. Today at around 6:40 I was just about to go pick up another G5 also a 2.7GHz for parts to replace the power supply. Right before I left, I plugged my Mac in one last time and poof, it turned on. I couldn't believe it, right before I went to replace it the G5 came back almost as if to say "not so fast".
Now what's happening when I press the power button is:
fans spin up, then slow down to normal speed
hard drive spins up
no chime
front LED only comes on when it is pressed
red LED behind the processors on logic board (not the one by the RAM)
after approx. five minutes fans speed up and after ten minutes they are at terminal velocity
will not communicate with any peripherals
only way to turn it off is pressing the CUDA or pulling the plug
Things tried:
CUDA reset
cold start
Some more info on the machine:
RAM is tested and good
DVD-RW is good
all fans run
I don't have the original disks
I don't have a monitor for it (since it never worked)
Any help would be greatly appreciated, as my iMac is really showing its age and finances are tight.
Thanks!

This is a liquid cooled Mac, It is most likely leaking/oozing something on the processors.
I recommend a complete disassemble of the machine and clean all the crud off the processors and anywhere else its found, it's important to catch this as early as possible because that stuff is so acidic it will actually eat the traces right off a circuit board!
As for the liquid cooling unit I personally:
remove heat transfer plates and clean them in an ultrasonic cleaner.
drain system and flush with fresh water, dry thoroughly, and then seal transfer plates with Permatex thermostat sealing compound (automotive store) new "O" rings would be a good idea I suppose, but I have cleaned and used the originals over with good results.
I fill mine with a 50/50 mix of prestone or equivalent
A service manual will help with disassembling the machine.
Hope this helps some

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