Help! - my G5 won't start up anymore

When I woke my G5 1.8DP on 10.4.11 (Jan 05) this morning from sleep it froze and the fans went really loud.
I had to restart it with the power button, but it doesn't start up anymore now. The fans go on and turn really loud after about 2 minutes and the screen stays black (in sleep mode - lights pulsing). I can hear some of the usual whirring start-up noise. The light on the front doesn't go on, only when I press the power button to turn it off again it lights up. I did that a few time, disconnected it from the power supply, but no change. No start up sound, but I turned my computer on mute anyway.
When I opened it up I noticed that it was really dusty inside. I cleaned it all up (carefully) but no change.
It won't react to anything, so I can't reset the PRAM, insert the startup disc or do anything else.
No external backup (I know...) I could start from either.
I didn't do anything unusual and it has been working well even after he last update a few weeks ago. Just did lots of different, high memory things with it since last shutting it down.
Any ideas what I can do?
I have deadlines tomorrow and tons of work on at the moment... AAArghhh
Many thanks in advance!

Brought an iMac back home from work so that I can do stuff here as well. And keep checking for any feedback.
Just had a look - my computer was bought in March 2004 - so it's one of the older versions, which are not directly addresses in the topic.
I just tried the previous suggestions again, but no change.
I managed to get the start-up disc in, bit it won't mount from it (it does move the disc around though - can hear it). It seems more and more that, although there is some power, there's no power to the hard drives as nothing comes up at all
Anybody else has another idea?
Battery? Power cable?
Might bring it to the shop tomorrow.

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