G5 wont boot from disc or dvd

My G5 will not boot at all either from an intsall disc or the internal HD. I have tried all the usual, reseting pram,nvram from open firmware, resetting the cuda switch etc but still no joy. When i start up the machine i get the apple logo on the white screen, and then the fans fire up after about a minute and carry on at full speed.If i try to start up in single user mode i get a lot of messages saying failed to load com.apple.driver.applemacrisc.pc amongst other things and then i get a kernel panic.
Can any one help me with this one? [p.s. i have tried removing all connected devices and non apple memory but still the same]

Can you start in safe mode?
-mj
[email protected]

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