G5 won't boot but will go to target disk mode

Hi,
Well it started like this: suddenly a dark grey veil lowered across the screen with a notice in several languages saying "you must restart your mac" (or something to that effect). I panicked and pressed the power button, the mac shut down.
I started it again but it only got as far as the grey Apple screen and then sat there for a while until the fans started ramping up in the famous jet engine style. I shut it down again.
I have tried starting it:
In single user mode = no joy, same as above
In safe mode = some text on a black background, keyboard not functional, fans start going crazy again.
In target disk mode = everything exactly as one might expect, all files accessable, fans ticking over normally.
I have attached an ibook to it, booted the G5 in Target disk mode and run disk utility, repair, but it reported the disk "could not be unmounted". There was a lot of clicking from the G5 though so I assume something happened. I then ran "verify" and it reported that everything was fine.
The G5 still won't start, exhibiting the same symtoms as before.
Anyone got any ideas?
Cheers,
Cliff

Hi Cliff, and a warm welcome to the forums!
See if any of this gives us more clues....
How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
PM G5 won't start...
http://support.apple.com/kb/HT2173

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