PowerPC G5 not starting up after continuous fan problem

Hi - Ive seen similar problems on the forums but would like to write down my own case in case it varies from others.
Recently, Ive been returning to my mac after periods of leaving it alone to find the fan wizzing continuously and the computer frozen. Ive had to turn it off and on again to get it working. Its done it previously once or twice maybe a couple of years ago, but has started doing it more frequently over the last few weeks.
Anyway.. today it did it again. I immediatlely tried zapping the pram after reading that this may help, but now it doesnt boot at all!
Im getting really stressed as it has all my work on it and I really cant do without it for long
Ive tried zapping the pram again but after holding down the keys the screen just stays black and I dont get another boing.
I did leave it shut down for a while, started back up, after a while it did display my desktop image but then did nothing else
Would anybody know what the problem may be?
many thanks

The G5 is quite an old one (maybe 4 or 5 years) it was the last of the PowerPc versions before the intel came in I think - pretty sure its not water cooled
If it isn't a 2.5GHz or a 2.7GHz machine, then it isn't liquid cooled.
If it is one of those, look for leaks.
For more info on LCS leaks, see my post here:
http://discussions.apple.com/thread.jspa?messageID=9846620&#9846620
haven't tried reseating the RAM however and will give this a try tomorrow when Im back home. I wouldn't know which the graphics card is actually but Im sure I can find out
Instructions here:
http://support.apple.com/kb/HT2580
So do you think some disconnected RAM could actually be the problem? Im getting quite worried about this actually as I cant afford a new computer at the moment :-s
Not so much the RAM, but the slots/logic board.
Remove all your RAM (keep pairs together).
With the original shipping RAM (use only 1 pair) place the two DIMMs in the center two slots.
Try booting.
If still a not booting, move that pair of DIMMs out one slot. Try booting.
If only one pair of slots is affected, leave the affected slots empty. The machine may be returned to service, all be it with less RAM.
If the moving of the RAM does not provide relief, another test for logic board/RAM slot problems, is to heat the logic board around the RAM slots with a hair dryer.
Heat the board until it is toasty warm, then try booting.
If you get the machine to boot during the heating tests, take that opportunity to back up all data.
Don't shut the machine down, though.
Machines with this type of problem may run for days without fail, but the problem is severe, and ultimately means a new logic board, or repair of the logic board by 3rd party.
Either way, the failure is $350-$700+ to repair or replace.
Message was edited by: japamac

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Dreained it to the state of sleep nd then waited for the sleep light to go off.
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