PowerMac wont start up - Gets to Apple screen then goes black

Recently my 2.5Ghz DP PowerMac G5 has been behaving badly and now it appears to have died!
On startup it gets to the grey background with the Apple then nothing. No spinning gear and no Hard Drive activity from the Mac. After switching off and trying again not even the Apple screen comes up I just get a black screen. If I leave it a while then try again I get the Apple screen again but nothing else.
Tried starting up in 'Safe Mode' with shift pressed but using wireless keyboard and mouse wasn't sure if keyboard is recognised until Mac has fully booted. Tried switching to conventinal wired keyboard and mouse but still nothing - it's as if the keyboard isn't being found as the light on the Caps lock doesn't work while attemping a boot up. Does it matter where the keyboard is plugged in? Mac or monitor?
I can only think to take it in to Apple for repair but if anyone has any suggestions or ideas I would be very grateful!

Hi-
The 2.5GHz machine is liquid cooled.
Open up the tower, and look for signs of leakage:
http://www.fusina.net/G5coolantleaks/gallery.php
http://www.fusina.net/G5coolantleaks/index.php?lg=uk
http://www.youtube.com/watch?v=ZDyIIFyUpGI
http://www.xlr8yourmac.com/systems/G5coolantleaks.html
http://www.macintouch.com/readerreports/powermacg5/topic4243.html
http://www.macsimumnews.com/index.php/archive/macosgliquidcooled_power_mac_g5sleaking

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